--version
Print the program version and licensing information. Note that you cannot abbreviate this
command.
|
--help
-h Print a usage message summarizing the most useful command line options. Note that you cannot
abbreviate this command.
|
--warranty
Print warranty information.
|
--dump-options
Print a list of all available options and commands. Note that you cannot abbreviate this command.
|
Commands to select the type of operation
--sign
-s Make a signature. This command may be combined with --encrypt (for a signed and encrypted
message), --symmetric (for a signed and symmetrically encrypted message), or --encrypt and
--symmetric together (for a signed message that may be decrypted via a secret key or a
passphrase). The key to be used for signing is chosen by default or can be set with the --local-
user and --default-key options.
|
--clearsign
Make a clear text signature. The content in a clear text signature is readable without any
special software. OpenPGP software is only needed to verify the signature. Clear text signatures
may modify end-of-line whitespace for platform independence and are not intended to be reversible.
The key to be used for signing is chosen by default or can be set with the --local-user and
--default-key options.
|
--detach-sign
-b Make a detached signature.
|
--encrypt
-e Encrypt data. This option may be combined with --sign (for a signed and encrypted message),
--symmetric (for a message that may be decrypted via a secret key or a passphrase), or --sign and
--symmetric together (for a signed message that may be decrypted via a secret key or a
passphrase).
|
--symmetric
-c Encrypt with a symmetric cipher using a passphrase. The default symmetric cipher used is CAST5,
but may be chosen with the --cipher-algo option. This option may be combined with --sign (for a
signed and symmetrically encrypted message), --encrypt (for a message that may be decrypted via a
secret key or a passphrase), or --sign and --encrypt together (for a signed message that may be
decrypted via a secret key or a passphrase).
|
--store
Store only (make a simple RFC1991 literal data packet).
|
--decrypt
-d Decrypt the file given on the command line (or STDIN if no file is specified) and write it to
STDOUT (or the file specified with --output). If the decrypted file is signed, the signature is
also verified. This command differs from the default operation, as it never writes to the filename
which is included in the file and it rejects files which don't begin with an encrypted message.
|
--verify
Assume that the first argument is a signed file or a detached signature and verify it without
generating any output. With no arguments, the signature packet is read from STDIN. If only a
sigfile is given, it may be a complete signature or a detached signature, in which case the signed
stuff is expected in a file without the ".sig" or ".asc" extension. With more than 1 argument,
the first should be a detached signature and the remaining files are the signed stuff. To read the
signed stuff from STDIN, use '-'' as the second filename. For security reasons a detached
signature cannot read the signed material from STDIN without denoting it in the above way.
|
--multifile
This modifies certain other commands to accept multiple files for processing on the command line
or read from STDIN with each filename on a separate line. This allows for many files to be
processed at once. --multifile may currently be used along with --verify, --encrypt, and
--decrypt. Note that --multifile --verify may not be used with detached signatures.
|
--verify-files
Identical to --multifile --verify.
|
--encrypt-files
Identical to --multifile --encrypt.
|
--decrypt-files
Identical to --multifile --decrypt.
|
--list-keys
-k
--list-public-keys
List all keys from the public keyrings, or just the keys given on the command line. -k is
slightly different from --list-keys in that it allows only for one argument and takes the second
argument as the keyring to search. This is for command line compatibility with PGP 2 and has been
removed in gpg2.
Avoid using the output of this command in scripts or other programs as it is likely to change as
GnuPG changes. See --with-colons for a machine-parseable key listing command that is appropriate
for use in scripts and other programs.
|
--list-secret-keys
-K List all keys from the secret keyrings, or just the ones given on the command line. A # after the
letters sec means that the secret key is not usable (for example, if it was created via --export-
secret-subkeys).
|
--list-sigs
Same as --list-keys, but the signatures are listed too.
For each signature listed, there are several flags in between the "sig" tag and keyid. These flags
give additional information about each signature. From left to right, they are the numbers 1-3 for
certificate check level (see --ask-cert-level), "L" for a local or non-exportable signature (see
--lsign-key), "R" for a nonRevocable signature (see the --edit-key command "nrsign"), "P" for a
signature that contains a policy URL (see --cert-policy-url), "N" for a signature that contains a
notation (see --cert-notation), "X" for an eXpired signature (see --ask-cert-expire), and the
numbers 1-9 or "T" for 10 and above to indicate trust signature levels (see the --edit-key command
"tsign").
|
--check-sigs
Same as --list-sigs, but the signatures are verified. Note that for performance reasons the
revocation status of a signing key is not shown.
The status of the verification is indicated by a flag directly following the "sig" tag (and thus
before the flags described above for --list-sigs). A "!" indicates that the signature has been
successfully verified, a "-" denotes a bad signature and a "%" is used if an error occurred while
checking the signature (e.g. a non supported algorithm).
|
--fingerprint
List all keys (or the specified ones) along with their fingerprints. This is the same output as
--list-keys but with the additional output of a line with the fingerprint. May also be combined
with --list-sigs or --check-sigs. If this command is given twice, the fingerprints of all
secondary keys are listed too.
|
--list-packets
List only the sequence of packets. This is mainly useful for debugging.
|
--card-edit
Present a menu to work with a smartcard. The subcommand "help" provides an overview on available
commands. For a detailed description, please see the Card HOWTO at
http://www.gnupg.org/documentation/howtos.html#GnuPG-cardHOWTO .
|
--card-status
Show the content of the smart card.
|
--change-pin
Present a menu to allow changing the PIN of a smartcard. This functionality is also available as
the subcommand "passwd" with the --card-edit command.
|
--delete-key name
Remove key from the public keyring. In batch mode either --yes is required or the key must be
specified by fingerprint. This is a safeguard against accidental deletion of multiple keys.
|
--delete-secret-key name
Remove key from the secret and public keyring. In batch mode the key must be specified by
fingerprint.
|
--delete-secret-and-public-key name
Same as --delete-key, but if a secret key exists, it will be removed first. In batch mode the key
must be specified by fingerprint.
|
--export
Either export all keys from all keyrings (default keyrings and those registered via option
--keyring), or if at least one name is given, those of the given name. The new keyring is written
to STDOUT or to the file given with option --output. Use together with --armor to mail those keys.
|
--send-keys key IDs
Similar to --export but sends the keys to a keyserver. Fingerprints may be used instead of key
IDs. Option --keyserver must be used to give the name of this keyserver. Don't send your complete
keyring to a keyserver --- select only those keys which are new or changed by you. If no key IDs
are given, gpg does nothing.
|
--export-secret-keys
--export-secret-subkeys
Same as --export, but exports the secret keys instead. This is normally not very useful and a
security risk. The second form of the command has the special property to render the secret part
of the primary key useless; this is a GNU extension to OpenPGP and other implementations can not
be expected to successfully import such a key. See the option --simple-sk-checksum if you want to
import such an exported key with an older OpenPGP implementation.
|
--import
--fast-import
Import/merge keys. This adds the given keys to the keyring. The fast version is currently just a
synonym.
There are a few other options which control how this command works. Most notable here is the
--import-options merge-only option which does not insert new keys but does only the merging of new
signatures, user-IDs and subkeys.
|
--recv-keys key IDs
Import the keys with the given key IDs from a keyserver. Option --keyserver must be used to give
the name of this keyserver.
|
--refresh-keys
Request updates from a keyserver for keys that already exist on the local keyring. This is useful
for updating a key with the latest signatures, user IDs, etc. Calling this with no arguments will
refresh the entire keyring. Option --keyserver must be used to give the name of the keyserver for
all keys that do not have preferred keyservers set (see --keyserver-options honor-keyserver-url).
|
--search-keys names
Search the keyserver for the given names. Multiple names given here will be joined together to
create the search string for the keyserver. Option --keyserver must be used to give the name of
this keyserver. Keyservers that support different search methods allow using the syntax specified
in "How to specify a user ID" below. Note that different keyserver types support different search
methods. Currently only LDAP supports them all.
|
--fetch-keys URIs
Retrieve keys located at the specified URIs. Note that different installations of GnuPG may
support different protocols (HTTP, FTP, LDAP, etc.)
|
--update-trustdb
Do trust database maintenance. This command iterates over all keys and builds the Web of Trust.
This is an interactive command because it may have to ask for the "ownertrust" values for keys.
The user has to give an estimation of how far she trusts the owner of the displayed key to
correctly certify (sign) other keys. GnuPG only asks for the ownertrust value if it has not yet
been assigned to a key. Using the --edit-key menu, the assigned value can be changed at any time.
|
--check-trustdb
Do trust database maintenance without user interaction. From time to time the trust database must
be updated so that expired keys or signatures and the resulting changes in the Web of Trust can be
tracked. Normally, GnuPG will calculate when this is required and do it automatically unless --no-
auto-check-trustdb is set. This command can be used to force a trust database check at any time.
The processing is identical to that of --update-trustdb but it skips keys with a not yet defined
"ownertrust".
For use with cron jobs, this command can be used together with --batch in which case the trust
database check is done only if a check is needed. To force a run even in batch mode add the option
--yes.
|
--export-ownertrust
Send the ownertrust values to STDOUT. This is useful for backup purposes as these values are the
only ones which can't be re-created from a corrupted trustdb. Example:
gpg --export-ownertrust > otrust.txt
|
--import-ownertrust
Update the trustdb with the ownertrust values stored in files (or STDIN if not given); existing
values will be overwritten. In case of a severely damaged trustdb and if you have a recent backup
of the ownertrust values (e.g. in the file `otrust.txt', you may re-create the trustdb using these
commands:
cd ~/.gnupg
rm trustdb.gpg
gpg --import-ownertrust < otrust.txt
|
--rebuild-keydb-caches
When updating from version 1.0.6 to 1.0.7 this command should be used to create signature caches
in the keyring. It might be handy in other situations too.
|
--print-md algo
--print-mds
Print message digest of algorithm ALGO for all given files or STDIN. With the second form (or a
deprecated "*" as algo) digests for all available algorithms are printed.
|
--gen-random 0|1|2 count
Emit count random bytes of the given quality level 0, 1 or 2. If count is not given or zero, an
endless sequence of random bytes will be emitted. If used with --armor the output will be base64
encoded. PLEASE, don't use this command unless you know what you are doing; it may remove
precious entropy from the system!
|
--gen-prime mode bits
Use the source, Luke :-). The output format is still subject to change.
|
--enarmor
--dearmor
Pack or unpack an arbitrary input into/from an OpenPGP ASCII armor. This is a GnuPG extension to
OpenPGP and in general not very useful.
|
--gen-key
Generate a new key pair. This command is normally only used interactively.
There is an experimental feature which allows you to create keys in batch mode. See the file
`doc/DETAILS' in the source distribution on how to use this.
|
--gen-revoke name
Generate a revocation certificate for the complete key. To revoke a subkey or a signature, use the
--edit command.
|
--desig-revoke name
Generate a designated revocation certificate for a key. This allows a user (with the permission of
the keyholder) to revoke someone else's key.
|
--edit-key
Present a menu which enables you to do most of the key management related tasks. It expects the
specification of a key on the command line.
|
--sign-key name
Signs a public key with your secret key. This is a shortcut version of the subcommand "sign" from
--edit.
|
--lsign-key name
Signs a public key with your secret key but marks it as non-exportable. This is a shortcut version
of the subcommand "lsign" from --edit-key.
|
--default-key name
Use name as the default key to sign with. If this option is not used, the default key is the first
key found in the secret keyring. Note that -u or --local-user overrides this option.
|
--default-recipient name
Use name as default recipient if option --recipient is not used and don't ask if this is a valid
one. name must be non-empty.
|
--default-recipient-self
Use the default key as default recipient if option --recipient is not used and don't ask if this
is a valid one. The default key is the first one from the secret keyring or the one set with
--default-key.
|
--no-default-recipient
Reset --default-recipient and --default-recipient-self.
|
-v, --verbose
Give more information during processing. If used twice, the input data is listed in detail.
|
--no-verbose
Reset verbose level to 0.
|
-q, --quiet
Try to be as quiet as possible.
|
--batch
|
--no-batch
Use batch mode. Never ask, do not allow interactive commands. --no-batch disables this option.
Note that even with a filename given on the command line, gpg might still need to read from STDIN
(in particular if gpg figures that the input is a detached signature and no data file has been
specified). Thus if you do not want to feed data via STDIN, you should connect STDIN to
`/dev/null'.
|
--no-tty
Make sure that the TTY (terminal) is never used for any output. This option is needed in some
cases because GnuPG sometimes prints warnings to the TTY even if --batch is used.
|
--yes Assume "yes" on most questions.
|
--no Assume "no" on most questions.
|
--list-options parameters
This is a space or comma delimited string that gives options used when listing keys and signatures
(that is, --list-keys, --list-sigs, --list-public-keys, --list-secret-keys, and the --edit-key
functions). Options can be prepended with a no- (after the two dashes) to give the opposite
meaning. The options are:
show-photos
Causes --list-keys, --list-sigs, --list-public-keys, and --list-secret-keys to display any
photo IDs attached to the key. Defaults to no. See also --photo-viewer.
show-policy-urls
Show policy URLs in the --list-sigs or --check-sigs listings. Defaults to no.
show-notations
show-std-notations
show-user-notations
Show all, IETF standard, or user-defined signature notations in the --list-sigs or --check-
sigs listings. Defaults to no.
show-keyserver-urls
Show any preferred keyserver URL in the --list-sigs or --check-sigs listings. Defaults to
no.
show-uid-validity
Display the calculated validity of user IDs during key listings. Defaults to no.
show-unusable-uids
Show revoked and expired user IDs in key listings. Defaults to no.
show-unusable-subkeys
Show revoked and expired subkeys in key listings. Defaults to no.
show-keyring
Display the keyring name at the head of key listings to show which keyring a given key
resides on. Defaults to no.
show-sig-expire
Show signature expiration dates (if any) during --list-sigs or --check-sigs listings.
Defaults to no.
show-sig-subpackets
Include signature subpackets in the key listing. This option can take an optional argument
list of the subpackets to list. If no argument is passed, list all subpackets. Defaults to
no. This option is only meaningful when using --with-colons along with --list-sigs or
--check-sigs.
|
--verify-options parameters
This is a space or comma delimited string that gives options used when verifying signatures.
Options can be prepended with a `no-' to give the opposite meaning. The options are:
show-photos
Display any photo IDs present on the key that issued the signature. Defaults to no. See
also --photo-viewer.
show-policy-urls
Show policy URLs in the signature being verified. Defaults to no.
show-notations
show-std-notations
show-user-notations
Show all, IETF standard, or user-defined signature notations in the signature being
verified. Defaults to IETF standard.
show-keyserver-urls
Show any preferred keyserver URL in the signature being verified. Defaults to no.
show-uid-validity
Display the calculated validity of the user IDs on the key that issued the signature.
Defaults to no.
show-unusable-uids
Show revoked and expired user IDs during signature verification. Defaults to no.
show-primary-uid-only
Show only the primary user ID during signature verification. That is all the AKA lines as
well as photo Ids are not shown with the signature verification status.
pka-lookups
Enable PKA lookups to verify sender addresses. Note that PKA is based on DNS, and so
enabling this option may disclose information on when and what signatures are verified or
to whom data is encrypted. This is similar to the "web bug" described for the auto-key-
retrieve feature.
pka-trust-increase
Raise the trust in a signature to full if the signature passes PKA validation. This option
is only meaningful if pka-lookups is set.
|
--enable-dsa2
--disable-dsa2
Enable hash truncation for all DSA keys even for old DSA Keys up to 1024 bit. This is also the
default with --openpgp. Note that older versions of GnuPG also required this flag to allow the
generation of DSA larger than 1024 bit.
|
--photo-viewer string
This is the command line that should be run to view a photo ID. "%i" will be expanded to a
filename containing the photo. "%I" does the same, except the file will not be deleted once the
viewer exits. Other flags are "%k" for the key ID, "%K" for the long key ID, "%f" for the key
fingerprint, "%t" for the extension of the image type (e.g. "jpg"), "%T" for the MIME type of the
image (e.g. "image/jpeg"), "%v" for the single-character calculated validity of the image being
viewed (e.g. "f"), "%V" for the calculated validity as a string (e.g. "full"), and "%%" for an
actual percent sign. If neither %i or %I are present, then the photo will be supplied to the
viewer on standard input.
The default viewer is "xloadimage -fork -quiet -title 'KeyID 0x%k' STDIN". Note that if your image
viewer program is not secure, then executing it from GnuPG does not make it secure.
|
--exec-path string
Sets a list of directories to search for photo viewers and keyserver helpers. If not provided,
keyserver helpers use the compiled-in default directory, and photo viewers use the $PATH
environment variable. Note, that on W32 system this value is ignored when searching for keyserver
helpers.
|
--keyring file
Add file to the current list of keyrings. If file begins with a tilde and a slash, these are
replaced by the $HOME directory. If the filename does not contain a slash, it is assumed to be in
the GnuPG home directory ("~/.gnupg" if --homedir or $GNUPGHOME is not used).
Note that this adds a keyring to the current list. If the intent is to use the specified keyring
alone, use --keyring along with --no-default-keyring.
|
--secret-keyring file
Same as --keyring but for the secret keyrings.
|
--primary-keyring file
Designate file as the primary public keyring. This means that newly imported keys (via --import or
keyserver --recv-from) will go to this keyring.
|
--trustdb-name file
Use file instead of the default trustdb. If file begins with a tilde and a slash, these are
replaced by the $HOME directory. If the filename does not contain a slash, it is assumed to be in
the GnuPG home directory (`~/.gnupg' if --homedir or $GNUPGHOME is not used).
|
--homedir dir
Set the name of the home directory to dir. If this option is not used, the home directory defaults
to `~/.gnupg'. It is only recognized when given on the command line. It also overrides any home
directory stated through the environment variable `GNUPGHOME' or (on W32 systems) by means of the
Registry entry HKCU\Software\GNU\GnuPG:HomeDir.
|
--pcsc-driver file
Use file to access the smartcard reader. The current default is `libpcsclite.so.1' for GLIBC based
systems, `/System/Library/Frameworks/PCSC.framework/PCSC' for MAC OS X, `winscard.dll' for Windows
and `libpcsclite.so' for other systems.
|
--disable-ccid
Disable the integrated support for CCID compliant readers. This allows to fall back to one of the
other drivers even if the internal CCID driver can handle the reader. Note, that CCID support is
only available if libusb was available at build time.
|
--reader-port number_or_string
This option may be used to specify the port of the card terminal. A value of 0 refers to the first
serial device; add 32768 to access USB devices. The default is 32768 (first USB device). PC/SC or
CCID readers might need a string here; run the program in verbose mode to get a list of available
readers. The default is then the first reader found.
|
--display-charset name
Set the name of the native character set. This is used to convert some informational strings like
user IDs to the proper UTF-8 encoding. Note that this has nothing to do with the character set of
data to be encrypted or signed; GnuPG does not recode user-supplied data. If this option is not
used, the default character set is determined from the current locale. A verbosity level of 3
shows the chosen set. Valid values for name are:
iso-8859-1
This is the Latin 1 set.
iso-8859-2
The Latin 2 set.
iso-8859-15
This is currently an alias for the Latin 1 set.
koi8-r The usual Russian set (rfc1489).
utf-8 Bypass all translations and assume that the OS uses native UTF-8 encoding.
|
--utf8-strings
|
--no-utf8-strings
Assume that command line arguments are given as UTF8 strings. The default (--no-utf8-strings) is
to assume that arguments are encoded in the character set as specified by --display-charset. These
options affect all following arguments. Both options may be used multiple times.
|
--options file
Read options from file and do not try to read them from the default options file in the homedir
(see --homedir). This option is ignored if used in an options file.
|
--no-options
Shortcut for --options /dev/null. This option is detected before an attempt to open an option
file. Using this option will also prevent the creation of a `~/.gnupg' homedir.
|
-z n
--compress-level n
--bzip2-compress-level n
Set compression level to n for the ZIP and ZLIB compression algorithms. The default is to use the
default compression level of zlib (normally 6). --bzip2-compress-level sets the compression level
for the BZIP2 compression algorithm (defaulting to 6 as well). This is a different option from
--compress-level since BZIP2 uses a significant amount of memory for each additional compression
level. -z sets both. A value of 0 for n disables compression.
|
--bzip2-decompress-lowmem
Use a different decompression method for BZIP2 compressed files. This alternate method uses a bit
more than half the memory, but also runs at half the speed. This is useful under extreme low
memory circumstances when the file was originally compressed at a high --bzip2-compress-level.
|
--mangle-dos-filenames
|
--no-mangle-dos-filenames
Older version of Windows cannot handle filenames with more than one dot. --mangle-dos-filenames
causes GnuPG to replace (rather than add to) the extension of an output filename to avoid this
problem. This option is off by default and has no effect on non-Windows platforms.
|
--ask-cert-level
|
--no-ask-cert-level
When making a key signature, prompt for a certification level. If this option is not specified,
the certification level used is set via --default-cert-level. See --default-cert-level for
information on the specific levels and how they are used. --no-ask-cert-level disables this
option. This option defaults to no.
|
--default-cert-level n
The default to use for the check level when signing a key.
0 means you make no particular claim as to how carefully you verified the key.
1 means you believe the key is owned by the person who claims to own it but you could not, or did
not verify the key at all. This is useful for a "persona" verification, where you sign the key of
a pseudonymous user.
2 means you did casual verification of the key. For example, this could mean that you verified
that the key fingerprint and checked the user ID on the key against a photo ID.
3 means you did extensive verification of the key. For example, this could mean that you verified
the key fingerprint with the owner of the key in person, and that you checked, by means of a hard
to forge document with a photo ID (such as a passport) that the name of the key owner matches the
name in the user ID on the key, and finally that you verified (by exchange of email) that the
email address on the key belongs to the key owner.
Note that the examples given above for levels 2 and 3 are just that: examples. In the end, it is
up to you to decide just what "casual" and "extensive" mean to you.
This option defaults to 0 (no particular claim).
|
--min-cert-level
When building the trust database, treat any signatures with a certification level below this as
invalid. Defaults to 2, which disregards level 1 signatures. Note that level 0 "no particular
claim" signatures are always accepted.
|
--trusted-key long key ID
Assume that the specified key (which must be given as a full 8 byte key ID) is as trustworthy as
one of your own secret keys. This option is useful if you don't want to keep your secret keys (or
one of them) online but still want to be able to check the validity of a given recipient's or
signator's key.
|
--trust-model pgp|classic|direct|always|auto
Set what trust model GnuPG should follow. The models are:
pgp This is the Web of Trust combined with trust signatures as used in PGP 5.x and later. This
is the default trust model when creating a new trust database.
classic
This is the standard Web of Trust as used in PGP 2.x and earlier.
direct Key validity is set directly by the user and not calculated via the Web of Trust.
always Skip key validation and assume that used keys are always fully trusted. You generally won't
use this unless you are using some external validation scheme. This option also suppresses
the "[uncertain]" tag printed with signature checks when there is no evidence that the user
ID is bound to the key.
auto Select the trust model depending on whatever the internal trust database says. This is the
default model if such a database already exists.
|
--auto-key-locate parameters
--no-auto-key-locate
GnuPG can automatically locate and retrieve keys as needed using this option. This happens when
encrypting to an email address (in the "user@example.com" form), and there are no user@example.com
keys on the local keyring. This option takes any number of the following mechanisms, in the order
they are to be tried:
cert Locate a key using DNS CERT, as specified in rfc4398.
pka Locate a key using DNS PKA.
ldap Using DNS Service Discovery, check the domain in question for any LDAP keyservers to use.
If this fails, attempt to locate the key using the PGP Universal method of checking
'ldap://keys.(thedomain)''.
keyserver
Locate a key using whatever keyserver is defined using the --keyserver option.
keyserver-URL
In addition, a keyserver URL as used in the --keyserver option may be used here to query
that particular keyserver.
local Locate the key using the local keyrings. This mechanism allows to select the order a local
key lookup is done. Thus using '--auto-key-locate local'' is identical to --no-auto-key-
locate.
nodefault
This flag disables the standard local key lookup, done before any of the mechanisms defined
by the --auto-key-locate are tried. The position of this mechanism in the list does not
matter. It is not required if local is also used.
|
--keyid-format short|0xshort|long|0xlong
Select how to display key IDs. "short" is the traditional 8-character key ID. "long" is the more
accurate (but less convenient) 16-character key ID. Add an "0x" to either to include an "0x" at
the beginning of the key ID, as in 0x99242560.
|
--keyserver name
Use name as your keyserver. This is the server that --recv-keys, --send-keys, and --search-keys
will communicate with to receive keys from, send keys to, and search for keys on. The format of
the name is a URI: `scheme:[//]keyservername[:port]' The scheme is the type of keyserver: "hkp"
for the HTTP (or compatible) keyservers, "ldap" for the LDAP keyservers, or "mailto" for the Graff
email keyserver. Note that your particular installation of GnuPG may have other keyserver types
available as well. Keyserver schemes are case-insensitive. After the keyserver name, optional
keyserver configuration options may be provided. These are the same as the global --keyserver-
options from below, but apply only to this particular keyserver.
Most keyservers synchronize with each other, so there is generally no need to send keys to more
than one server. The keyserver hkp://keys.gnupg.net uses round robin DNS to give a different
keyserver each time you use it.
|
--keyserver-options name=value1
This is a space or comma delimited string that gives options for the keyserver. Options can be
prefixed with a `no-' to give the opposite meaning. Valid import-options or export-options may be
used here as well to apply to importing (--recv-key) or exporting (--send-key) a key from a
keyserver. While not all options are available for all keyserver types, some common options are:
include-revoked
When searching for a key with --search-keys, include keys that are marked on the keyserver
as revoked. Note that not all keyservers differentiate between revoked and unrevoked keys,
and for such keyservers this option is meaningless. Note also that most keyservers do not
have cryptographic verification of key revocations, and so turning this option off may
result in skipping keys that are incorrectly marked as revoked.
include-disabled
When searching for a key with --search-keys, include keys that are marked on the keyserver
as disabled. Note that this option is not used with HKP keyservers.
auto-key-retrieve
This option enables the automatic retrieving of keys from a keyserver when verifying
signatures made by keys that are not on the local keyring.
Note that this option makes a "web bug" like behavior possible. Keyserver operators can
see which keys you request, so by sending you a message signed by a brand new key (which
you naturally will not have on your local keyring), the operator can tell both your IP
address and the time when you verified the signature.
honor-keyserver-url
When using --refresh-keys, if the key in question has a preferred keyserver URL, then use
that preferred keyserver to refresh the key from. In addition, if auto-key-retrieve is set,
and the signature being verified has a preferred keyserver URL, then use that preferred
keyserver to fetch the key from. Defaults to yes.
honor-pka-record
If auto-key-retrieve is set, and the signature being verified has a PKA record, then use
the PKA information to fetch the key. Defaults to yes.
include-subkeys
When receiving a key, include subkeys as potential targets. Note that this option is not
used with HKP keyservers, as they do not support retrieving keys by subkey id.
use-temp-files
On most Unix-like platforms, GnuPG communicates with the keyserver helper program via
pipes, which is the most efficient method. This option forces GnuPG to use temporary files
to communicate. On some platforms (such as Win32 and RISC OS), this option is always
enabled.
keep-temp-files
If using `use-temp-files', do not delete the temp files after using them. This option is
useful to learn the keyserver communication protocol by reading the temporary files.
verbose
Tell the keyserver helper program to be more verbose. This option can be repeated multiple
times to increase the verbosity level.
timeout
Tell the keyserver helper program how long (in seconds) to try and perform a keyserver
action before giving up. Note that performing multiple actions at the same time uses this
timeout value per action. For example, when retrieving multiple keys via --recv-keys, the
timeout applies separately to each key retrieval, and not to the --recv-keys command as a
whole. Defaults to 30 seconds.
http-proxy=value
Set the proxy to use for HTTP and HKP keyservers. This overrides the "http_proxy"
environment variable, if any.
max-cert-size
When retrieving a key via DNS CERT, only accept keys up to this size. Defaults to 16384
bytes.
debug Turn on debug output in the keyserver helper program. Note that the details of debug
output depends on which keyserver helper program is being used, and in turn, on any
libraries that the keyserver helper program uses internally (libcurl, openldap, etc).
check-cert
Enable certificate checking if the keyserver presents one (for hkps or ldaps). Defaults to
on.
ca-cert-file
Provide a certificate store to override the system default. Only necessary if check-cert
is enabled, and the keyserver is using a certificate that is not present in a system
default certificate list.
Note that depending on the SSL library that the keyserver helper is built with, this may
actually be a directory or a file.
|
--completes-needed n
Number of completely trusted users to introduce a new key signer (defaults to 1).
|
--marginals-needed n
Number of marginally trusted users to introduce a new key signer (defaults to 3)
|
--max-cert-depth n
Maximum depth of a certification chain (default is 5).
|
--simple-sk-checksum
Secret keys are integrity protected by using a SHA-1 checksum. This method is part of the upcoming
enhanced OpenPGP specification but GnuPG already uses it as a countermeasure against certain
attacks. Old applications don't understand this new format, so this option may be used to switch
back to the old behaviour. Using this option bears a security risk. Note that using this option
only takes effect when the secret key is encrypted - the simplest way to make this happen is to
change the passphrase on the key (even changing it to the same value is acceptable).
|
--no-sig-cache
Do not cache the verification status of key signatures. Caching gives a much better performance
in key listings. However, if you suspect that your public keyring is not save against write
modifications, you can use this option to disable the caching. It probably does not make sense to
disable it because all kind of damage can be done if someone else has write access to your public
keyring.
|
--no-sig-create-check
GnuPG normally verifies each signature right after creation to protect against bugs and hardware
malfunctions which could leak out bits from the secret key. This extra verification needs some
time (about 115% for DSA keys), and so this option can be used to disable it. However, due to the
fact that the signature creation needs manual interaction, this performance penalty does not
matter in most settings.
|
--auto-check-trustdb
--no-auto-check-trustdb
If GnuPG feels that its information about the Web of Trust has to be updated, it automatically
runs the --check-trustdb command internally. This may be a time consuming process. --no-auto-
check-trustdb disables this option.
|
--use-agent
--no-use-agent
Try to use the GnuPG-Agent. With this option, GnuPG first tries to connect to the agent before it
asks for a passphrase. --no-use-agent disables this option.
|
--gpg-agent-info
Override the value of the environment variable 'GPG_AGENT_INFO''. This is only used when --use-
agent has been given. Given that this option is not anymore used by gpg2, it should be avoided if
possible.
|
--lock-once
Lock the databases the first time a lock is requested and do not release the lock until the
process terminates.
|
--lock-multiple
Release the locks every time a lock is no longer needed. Use this to override a previous --lock-
once from a config file.
|
--lock-never
Disable locking entirely. This option should be used only in very special environments, where it
can be assured that only one process is accessing those files. A bootable floppy with a stand-
alone encryption system will probably use this. Improper usage of this option may lead to data and
key corruption.
|
--exit-on-status-write-error
This option will cause write errors on the status FD to immediately terminate the process. That
should in fact be the default but it never worked this way and thus we need an option to enable
this, so that the change won't break applications which close their end of a status fd connected
pipe too early. Using this option along with --enable-progress-filter may be used to cleanly
cancel long running gpg operations.
|
--limit-card-insert-tries n
With n greater than 0 the number of prompts asking to insert a smartcard gets limited to N-1. Thus
with a value of 1 gpg won't at all ask to insert a card if none has been inserted at startup. This
option is useful in the configuration file in case an application does not know about the
smartcard support and waits ad infinitum for an inserted card.
|
--no-random-seed-file
GnuPG uses a file to store its internal random pool over invocations. This makes random
generation faster; however sometimes write operations are not desired. This option can be used to
achieve that with the cost of slower random generation.
|
--no-greeting
Suppress the initial copyright message.
|
--no-secmem-warning
Suppress the warning about "using insecure memory".
|
--no-permission-warning
Suppress the warning about unsafe file and home directory (--homedir) permissions. Note that the
permission checks that GnuPG performs are not intended to be authoritative, but rather they simply
warn about certain common permission problems. Do not assume that the lack of a warning means that
your system is secure.
Note that the warning for unsafe --homedir permissions cannot be suppressed in the gpg.conf file,
as this would allow an attacker to place an unsafe gpg.conf file in place, and use this file to
suppress warnings about itself. The --homedir permissions warning may only be suppressed on the
command line.
|
--no-mdc-warning
Suppress the warning about missing MDC integrity protection.
|
--require-secmem
|
--no-require-secmem
Refuse to run if GnuPG cannot get secure memory. Defaults to no (i.e. run, but give a warning).
|
--require-cross-certification
|
--no-require-cross-certification
When verifying a signature made from a subkey, ensure that the cross certification "back
signature" on the subkey is present and valid. This protects against a subtle attack against
subkeys that can sign. Defaults to --require-cross-certification for gpg.
|
--expert
--no-expert
Allow the user to do certain nonsensical or "silly" things like signing an expired or revoked key,
or certain potentially incompatible things like generating unusual key types. This also disables
certain warning messages about potentially incompatible actions. As the name implies, this option
is for experts only. If you don't fully understand the implications of what it allows you to do,
leave this off. --no-expert disables this option.
|
--recipient name
-r Encrypt for user id name. If this option or --hidden-recipient is not specified, GnuPG asks for
the user-id unless --default-recipient is given.
|
--hidden-recipient name
-R Encrypt for user ID name, but hide the key ID of this user's key. This option helps to hide the
receiver of the message and is a limited countermeasure against traffic analysis. If this option
or --recipient is not specified, GnuPG asks for the user ID unless --default-recipient is given.
|
--encrypt-to name
Same as --recipient but this one is intended for use in the options file and may be used with your
own user-id as an "encrypt-to-self". These keys are only used when there are other recipients
given either by use of --recipient or by the asked user id. No trust checking is performed for
these user ids and even disabled keys can be used.
|
--hidden-encrypt-to name
Same as --hidden-recipient but this one is intended for use in the options file and may be used
with your own user-id as a hidden "encrypt-to-self". These keys are only used when there are other
recipients given either by use of --recipient or by the asked user id. No trust checking is
performed for these user ids and even disabled keys can be used.
|
--no-encrypt-to
Disable the use of all --encrypt-to and --hidden-encrypt-to keys.
|
--group name=value1
Sets up a named group, which is similar to aliases in email programs. Any time the group name is
a recipient (-r or --recipient), it will be expanded to the values specified. Multiple groups with
the same name are automatically merged into a single group.
The values are key IDs or fingerprints, but any key description is accepted. Note that a value
with spaces in it will be treated as two different values. Note also there is only one level of
expansion --- you cannot make an group that points to another group. When used from the command
line, it may be necessary to quote the argument to this option to prevent the shell from treating
it as multiple arguments.
|
--ungroup name
Remove a given entry from the --group list.
|
--no-groups
Remove all entries from the --group list.
|
--local-user name
-u Use name as the key to sign with. Note that this option overrides --default-key.
|
--try-secret-key name
For hidden recipients GPG needs to know the keys to use for trial decryption. The key set with
--default-key is always tried first, but this is often not sufficient. This option allows to set
more keys to be used for trial decryption. Although any valid user-id specification may be used
for name it makes sense to use at least the long keyid to avoid ambiguities. Note that gpg-agent
might pop up a pinentry for a lot keys to do the trial decryption. If you want to stop all
further trial decryption you may use close-window button instead of the cancel button.
|
--try-all-secrets
Don't look at the key ID as stored in the message but try all secret keys in turn to find the
right decryption key. This option forces the behaviour as used by anonymous recipients (created by
using --throw-keyids or --hidden-recipient) and might come handy in case where an encrypted
message contains a bogus key ID.
|
--skip-hidden-recipients
|
--no-skip-hidden-recipients
During decryption skip all anonymous recipients. This option helps in the case that people use
the hidden recipients feature to hide there own encrypt-to key from others. If oneself has many
secret keys this may lead to a major annoyance because all keys are tried in turn to decrypt
soemthing which was not really intended for it. The drawback of this option is that it is
currently not possible to decrypt a message which includes real anonymous recipients.
|
--armor
-a Create ASCII armored output. The default is to create the binary OpenPGP format.
|
--no-armor
Assume the input data is not in ASCII armored format.
|
--output file
-o file
Write output to file.
|
--max-output n
This option sets a limit on the number of bytes that will be generated when processing a file.
Since OpenPGP supports various levels of compression, it is possible that the plaintext of a given
message may be significantly larger than the original OpenPGP message. While GnuPG works properly
with such messages, there is often a desire to set a maximum file size that will be generated
before processing is forced to stop by the OS limits. Defaults to 0, which means "no limit".
|
--import-options parameters
This is a space or comma delimited string that gives options for importing keys. Options can be
prepended with a `no-' to give the opposite meaning. The options are:
import-local-sigs
Allow importing key signatures marked as "local". This is not generally useful unless a
shared keyring scheme is being used. Defaults to no.
repair-pks-subkey-bug
During import, attempt to repair the damage caused by the PKS keyserver bug (pre version
0.9.6) that mangles keys with multiple subkeys. Note that this cannot completely repair the
damaged key as some crucial data is removed by the keyserver, but it does at least give you
back one subkey. Defaults to no for regular --import and to yes for keyserver --recv-keys.
merge-only
During import, allow key updates to existing keys, but do not allow any new keys to be
imported. Defaults to no.
import-clean
After import, compact (remove all signatures except the self-signature) any user IDs from
the new key that are not usable. Then, remove any signatures from the new key that are not
usable. This includes signatures that were issued by keys that are not present on the
keyring. This option is the same as running the --edit-key command "clean" after import.
Defaults to no.
import-minimal
Import the smallest key possible. This removes all signatures except the most recent self-
signature on each user ID. This option is the same as running the --edit-key command
"minimize" after import. Defaults to no.
|
--export-options parameters
This is a space or comma delimited string that gives options for exporting keys. Options can be
prepended with a `no-' to give the opposite meaning. The options are:
export-local-sigs
Allow exporting key signatures marked as "local". This is not generally useful unless a
shared keyring scheme is being used. Defaults to no.
export-attributes
Include attribute user IDs (photo IDs) while exporting. This is useful to export keys if
they are going to be used by an OpenPGP program that does not accept attribute user IDs.
Defaults to yes.
export-sensitive-revkeys
Include designated revoker information that was marked as "sensitive". Defaults to no.
export-reset-subkey-passwd
When using the --export-secret-subkeys command, this option resets the passphrases for all
exported subkeys to empty. This is useful when the exported subkey is to be used on an
unattended machine where a passphrase doesn't necessarily make sense. Defaults to no.
export-clean
Compact (remove all signatures from) user IDs on the key being exported if the user IDs are
not usable. Also, do not export any signatures that are not usable. This includes
signatures that were issued by keys that are not present on the keyring. This option is the
same as running the --edit-key command "clean" before export except that the local copy of
the key is not modified. Defaults to no.
export-minimal
Export the smallest key possible. This removes all signatures except the most recent self-
signature on each user ID. This option is the same as running the --edit-key command
"minimize" before export except that the local copy of the key is not modified. Defaults to
no.
|
--with-colons
Print key listings delimited by colons. Note that the output will be encoded in UTF-8 regardless
of any --display-charset setting. This format is useful when GnuPG is called from scripts and
other programs as it is easily machine parsed. The details of this format are documented in the
file `doc/DETAILS', which is included in the GnuPG source distribution.
|
--fixed-list-mode
Do not merge primary user ID and primary key in --with-colon listing mode and print all timestamps
as seconds since 1970-01-01.
|
--with-fingerprint
Same as the command --fingerprint but changes only the format of the output and may be used
together with another command.
|
--with-keygrip
Include the keygrip in the key listings.
|
-t, --textmode
--no-textmode
Treat input files as text and store them in the OpenPGP canonical text form with standard "CRLF"
line endings. This also sets the necessary flags to inform the recipient that the encrypted or
signed data is text and may need its line endings converted back to whatever the local system
uses. This option is useful when communicating between two platforms that have different line
ending conventions (UNIX-like to Mac, Mac to Windows, etc). --no-textmode disables this option,
and is the default.
If -t (but not --textmode) is used together with armoring and signing, this enables clearsigned
messages. This kludge is needed for command-line compatibility with command-line versions of PGP;
normally you would use --sign or --clearsign to select the type of the signature.
|
--force-v3-sigs
--no-force-v3-sigs
OpenPGP states that an implementation should generate v4 signatures but PGP versions 5 through 7
only recognize v4 signatures on key material. This option forces v3 signatures for signatures on
data. Note that this option implies --no-ask-sig-expire, and unsets --sig-policy-url, --sig-
notation, and --sig-keyserver-url, as these features cannot be used with v3 signatures. --no-
force-v3-sigs disables this option. Defaults to no.
|
--force-v4-certs
--no-force-v4-certs
Always use v4 key signatures even on v3 keys. This option also changes the default hash algorithm
for v3 RSA keys from MD5 to SHA-1. --no-force-v4-certs disables this option.
|
--force-mdc
Force the use of encryption with a modification detection code. This is always used with the newer
ciphers (those with a blocksize greater than 64 bits), or if all of the recipient keys indicate
MDC support in their feature flags.
|
--disable-mdc
Disable the use of the modification detection code. Note that by using this option, the encrypted
message becomes vulnerable to a message modification attack.
|
--personal-cipher-preferences string
Set the list of personal cipher preferences to string. Use gpg --version to get a list of
available algorithms, and use none to set no preference at all. This allows the user to safely
override the algorithm chosen by the recipient key preferences, as GPG will only select an
algorithm that is usable by all recipients. The most highly ranked cipher in this list is also
used for the --symmetric encryption command.
|
--personal-digest-preferences string
Set the list of personal digest preferences to string. Use gpg --version to get a list of
available algorithms, and use none to set no preference at all. This allows the user to safely
override the algorithm chosen by the recipient key preferences, as GPG will only select an
algorithm that is usable by all recipients. The most highly ranked digest algorithm in this list
is also used when signing without encryption (e.g. --clearsign or --sign). The default value is
SHA-1.
|
--personal-compress-preferences string
Set the list of personal compression preferences to string. Use gpg --version to get a list of
available algorithms, and use none to set no preference at all. This allows the user to safely
override the algorithm chosen by the recipient key preferences, as GPG will only select an
algorithm that is usable by all recipients. The most highly ranked compression algorithm in this
list is also used when there are no recipient keys to consider (e.g. --symmetric).
|
--s2k-cipher-algo name
Use name as the cipher algorithm used to protect secret keys. The default cipher is CAST5. This
cipher is also used for conventional encryption if --personal-cipher-preferences and --cipher-algo
is not given.
|
--s2k-digest-algo name
Use name as the digest algorithm used to mangle the passphrases. The default algorithm is SHA-1.
|
--s2k-mode n
Selects how passphrases are mangled. If n is 0 a plain passphrase (which is not recommended) will
be used, a 1 adds a salt to the passphrase and a 3 (the default) iterates the whole process a
number of times (see --s2k-count). Unless --rfc1991 is used, this mode is also used for
conventional encryption.
|
--s2k-count n
Specify how many times the passphrase mangling is repeated. This value may range between 1024 and
65011712 inclusive, and the default is 65536. Note that not all values in the 1024-65011712 range
are legal and if an illegal value is selected, GnuPG will round up to the nearest legal value.
This option is only meaningful if --s2k-mode is 3.
|
--gnupg
Use standard GnuPG behavior. This is essentially OpenPGP behavior (see --openpgp), but with some
additional workarounds for common compatibility problems in different versions of PGP. This is the
default option, so it is not generally needed, but it may be useful to override a different
compliance option in the gpg.conf file.
|
--openpgp
Reset all packet, cipher and digest options to strict OpenPGP behavior. Use this option to reset
all previous options like --s2k-*, --cipher-algo, --digest-algo and --compress-algo to OpenPGP
compliant values. All PGP workarounds are disabled.
|
--rfc4880
Reset all packet, cipher and digest options to strict RFC-4880 behavior. Note that this is
currently the same thing as --openpgp.
|
--rfc2440
Reset all packet, cipher and digest options to strict RFC-2440 behavior.
|
--rfc1991
Try to be more RFC-1991 (PGP 2.x) compliant.
|
--pgp2 Set up all options to be as PGP 2.x compliant as possible, and warn if an action is taken (e.g.
encrypting to a non-RSA key) that will create a message that PGP 2.x will not be able to handle.
Note that `PGP 2.x' here means `MIT PGP 2.6.2'. There are other versions of PGP 2.x available, but
the MIT release is a good common baseline.
This option implies --rfc1991 --disable-mdc --no-force-v4-certs --escape-from-lines --force-
v3-sigs --cipher-algo IDEA --digest-algo MD5 --compress-algo ZIP. It also disables --textmode when
encrypting.
|
--pgp6 Set up all options to be as PGP 6 compliant as possible. This restricts you to the ciphers IDEA
(if the IDEA plugin is installed), 3DES, and CAST5, the hashes MD5, SHA1 and RIPEMD160, and the
compression algorithms none and ZIP. This also disables --throw-keyids, and making signatures with
signing subkeys as PGP 6 does not understand signatures made by signing subkeys.
This option implies --disable-mdc --escape-from-lines --force-v3-sigs.
|
--pgp8 Set up all options to be as PGP 8 compliant as possible. PGP 8 is a lot closer to the OpenPGP
standard than previous versions of PGP, so all this does is disable --throw-keyids and set
--escape-from-lines. All algorithms are allowed except for the SHA224, SHA384, and SHA512
digests.
|
-n
--dry-run
Don't make any changes (this is not completely implemented).
|
--list-only
Changes the behaviour of some commands. This is like --dry-run but different in some cases. The
semantic of this command may be extended in the future. Currently it only skips the actual
decryption pass and therefore enables a fast listing of the encryption keys.
|
-i
--interactive
Prompt before overwriting any files.
|
--debug-level level
Select the debug level for investigating problems. level may be a numeric value or by a keyword:
none No debugging at all. A value of less than 1 may be used instead of the keyword.
basic Some basic debug messages. A value between 1 and 2 may be used instead of the keyword.
advanced
More verbose debug messages. A value between 3 and 5 may be used instead of the keyword.
expert Even more detailed messages. A value between 6 and 8 may be used instead of the keyword.
guru All of the debug messages you can get. A value greater than 8 may be used instead of the
keyword. The creation of hash tracing files is only enabled if the keyword is used.
How these messages are mapped to the actual debugging flags is not specified and may change with newer
releases of this program. They are however carefully selected to best aid in debugging.
|
--debug flags
Set debugging flags. All flags are or-ed and flags may be given in C syntax (e.g. 0x0042).
|
--debug-all
Set all useful debugging flags.
|
--debug-ccid-driver
Enable debug output from the included CCID driver for smartcards. Note that this option is only
available on some system.
|
--faked-system-time epoch
This option is only useful for testing; it sets the system time back or forth to epoch which is
the number of seconds elapsed since the year 1970. Alternatively epoch may be given as a full ISO
time string (e.g. "20070924T154812").
|
--enable-progress-filter
Enable certain PROGRESS status outputs. This option allows frontends to display a progress
indicator while gpg is processing larger files. There is a slight performance overhead using it.
|
--status-fd n
Write special status strings to the file descriptor n. See the file DETAILS in the documentation
for a listing of them.
|
--status-file file
Same as --status-fd, except the status data is written to file file.
|
--logger-fd n
Write log output to file descriptor n and not to STDERR.
|
--log-file file
--logger-file file
Same as --logger-fd, except the logger data is written to file file. Note that --log-file is only
implemented for GnuPG-2.
|
--attribute-fd n
Write attribute subpackets to the file descriptor n. This is most useful for use with --status-fd,
since the status messages are needed to separate out the various subpackets from the stream
delivered to the file descriptor.
|
--attribute-file file
Same as --attribute-fd, except the attribute data is written to file file.
|
--comment string
--no-comments
Use string as a comment string in clear text signatures and ASCII armored messages or keys (see
--armor). The default behavior is not to use a comment string. --comment may be repeated multiple
times to get multiple comment strings. --no-comments removes all comments. It is a good idea to
keep the length of a single comment below 60 characters to avoid problems with mail programs
wrapping such lines. Note that comment lines, like all other header lines, are not protected by
the signature.
|
--emit-version
--no-emit-version
Force inclusion of the version string in ASCII armored output. --no-emit-version disables this
option.
|
--sig-notation name=value
--cert-notation name=value
-N, --set-notation name=value
Put the name value pair into the signature as notation data. name must consist only of printable
characters or spaces, and must contain a '@' character in the form keyname@domain.example.com
(substituting the appropriate keyname and domain name, of course). This is to help prevent
pollution of the IETF reserved notation namespace. The --expert flag overrides the '@' check.
value may be any printable string; it will be encoded in UTF8, so you should check that your
--display-charset is set correctly. If you prefix name with an exclamation mark (!), the notation
data will be flagged as critical (rfc2440:5.2.3.15). --sig-notation sets a notation for data
signatures. --cert-notation sets a notation for key signatures (certifications). --set-notation
sets both.
There are special codes that may be used in notation names. "%k" will be expanded into the key ID
of the key being signed, "%K" into the long key ID of the key being signed, "%f" into the
fingerprint of the key being signed, "%s" into the key ID of the key making the signature, "%S"
into the long key ID of the key making the signature, "%g" into the fingerprint of the key making
the signature (which might be a subkey), "%p" into the fingerprint of the primary key of the key
making the signature, "%c" into the signature count from the OpenPGP smartcard, and "%%" results
in a single "%". %k, %K, and %f are only meaningful when making a key signature (certification),
and %c is only meaningful when using the OpenPGP smartcard.
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--sig-policy-url string
--cert-policy-url string
--set-policy-url string
Use string as a Policy URL for signatures (rfc2440:5.2.3.19). If you prefix it with an
exclamation mark (!), the policy URL packet will be flagged as critical. --sig-policy-url sets a
policy url for data signatures. --cert-policy-url sets a policy url for key signatures
(certifications). --set-policy-url sets both.
The same %-expandos used for notation data are available here as well.
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--sig-keyserver-url string
Use string as a preferred keyserver URL for data signatures. If you prefix it with an exclamation
mark (!), the keyserver URL packet will be flagged as critical.
The same %-expandos used for notation data are available here as well.
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--set-filename string
Use string as the filename which is stored inside messages. This overrides the default, which is
to use the actual filename of the file being encrypted.
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--for-your-eyes-only
--no-for-your-eyes-only
Set the `for your eyes only' flag in the message. This causes GnuPG to refuse to save the file
unless the --output option is given, and PGP to use a "secure viewer" with a claimed Tempest-
resistant font to display the message. This option overrides --set-filename. --no-for-your-eyes-
only disables this option.
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--use-embedded-filename
--no-use-embedded-filename
Try to create a file with a name as embedded in the data. This can be a dangerous option as it
allows to overwrite files. Defaults to no.
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--cipher-algo name
Use name as cipher algorithm. Running the program with the command --version yields a list of
supported algorithms. If this is not used the cipher algorithm is selected from the preferences
stored with the key. In general, you do not want to use this option as it allows you to violate
the OpenPGP standard. --personal-cipher-preferences is the safe way to accomplish the same thing.
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--digest-algo name
Use name as the message digest algorithm. Running the program with the command --version yields a
list of supported algorithms. In general, you do not want to use this option as it allows you to
violate the OpenPGP standard. --personal-digest-preferences is the safe way to accomplish the same
thing.
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--compress-algo name
Use compression algorithm name. "zlib" is RFC-1950 ZLIB compression. "zip" is RFC-1951 ZIP
compression which is used by PGP. "bzip2" is a more modern compression scheme that can compress
some things better than zip or zlib, but at the cost of more memory used during compression and
decompression. "uncompressed" or "none" disables compression. If this option is not used, the
default behavior is to examine the recipient key preferences to see which algorithms the recipient
supports. If all else fails, ZIP is used for maximum compatibility.
ZLIB may give better compression results than ZIP, as the compression window size is not limited
to 8k. BZIP2 may give even better compression results than that, but will use a significantly
larger amount of memory while compressing and decompressing. This may be significant in low memory
situations. Note, however, that PGP (all versions) only supports ZIP compression. Using any
algorithm other than ZIP or "none" will make the message unreadable with PGP. In general, you do
not want to use this option as it allows you to violate the OpenPGP standard. --personal-compress-
preferences is the safe way to accomplish the same thing.
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--cert-digest-algo name
Use name as the message digest algorithm used when signing a key. Running the program with the
command --version yields a list of supported algorithms. Be aware that if you choose an algorithm
that GnuPG supports but other OpenPGP implementations do not, then some users will not be able to
use the key signatures you make, or quite possibly your entire key.
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--disable-cipher-algo name
Never allow the use of name as cipher algorithm. The given name will not be checked so that a
later loaded algorithm will still get disabled.
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--disable-pubkey-algo name
Never allow the use of name as public key algorithm. The given name will not be checked so that a
later loaded algorithm will still get disabled.
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--throw-keyids
--no-throw-keyids
Do not put the recipient key IDs into encrypted messages. This helps to hide the receivers of the
message and is a limited countermeasure against traffic analysis. ([Using a little social
engineering anyone who is able to decrypt the message can check whether one of the other
recipients is the one he suspects.]) On the receiving side, it may slow down the decryption
process because all available secret keys must be tried. --no-throw-keyids disables this option.
This option is essentially the same as using --hidden-recipient for all recipients.
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--not-dash-escaped
This option changes the behavior of cleartext signatures so that they can be used for patch files.
You should not send such an armored file via email because all spaces and line endings are hashed
too. You can not use this option for data which has 5 dashes at the beginning of a line, patch
files don't have this. A special armor header line tells GnuPG about this cleartext signature
option.
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--escape-from-lines
--no-escape-from-lines
Because some mailers change lines starting with "From " to ">From " it is good to handle such
lines in a special way when creating cleartext signatures to prevent the mail system from breaking
the signature. Note that all other PGP versions do it this way too. Enabled by default. --no-
escape-from-lines disables this option.
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--passphrase-repeat n
Specify how many times gpg will request a new passphrase be repeated. This is useful for helping
memorize a passphrase. Defaults to 1 repetition.
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--passphrase-fd n
Read the passphrase from file descriptor n. Only the first line will be read from file descriptor
n. If you use 0 for n, the passphrase will be read from STDIN. This can only be used if only one
passphrase is supplied.
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--passphrase-file file
Read the passphrase from file file. Only the first line will be read from file file. This can only
be used if only one passphrase is supplied. Obviously, a passphrase stored in a file is of
questionable security if other users can read this file. Don't use this option if you can avoid
it.
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--passphrase string
Use string as the passphrase. This can only be used if only one passphrase is supplied. Obviously,
this is of very questionable security on a multi-user system. Don't use this option if you can
avoid it.
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--command-fd n
This is a replacement for the deprecated shared-memory IPC mode. If this option is enabled, user
input on questions is not expected from the TTY but from the given file descriptor. It should be
used together with --status-fd. See the file doc/DETAILS in the source distribution for details on
how to use it.
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--command-file file
Same as --command-fd, except the commands are read out of file file
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--allow-non-selfsigned-uid
--no-allow-non-selfsigned-uid
Allow the import and use of keys with user IDs which are not self-signed. This is not recommended,
as a non self-signed user ID is trivial to forge. --no-allow-non-selfsigned-uid disables.
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--allow-freeform-uid
Disable all checks on the form of the user ID while generating a new one. This option should only
be used in very special environments as it does not ensure the de-facto standard format of user
IDs.
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--ignore-time-conflict
GnuPG normally checks that the timestamps associated with keys and signatures have plausible
values. However, sometimes a signature seems to be older than the key due to clock problems. This
option makes these checks just a warning. See also --ignore-valid-from for timestamp issues on
subkeys.
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--ignore-valid-from
GnuPG normally does not select and use subkeys created in the future. This option allows the use
of such keys and thus exhibits the pre-1.0.7 behaviour. You should not use this option unless you
there is some clock problem. See also --ignore-time-conflict for timestamp issues with signatures.
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--ignore-crc-error
The ASCII armor used by OpenPGP is protected by a CRC checksum against transmission errors.
Occasionally the CRC gets mangled somewhere on the transmission channel but the actual content
(which is protected by the OpenPGP protocol anyway) is still okay. This option allows GnuPG to
ignore CRC errors.
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--ignore-mdc-error
This option changes a MDC integrity protection failure into a warning. This can be useful if a
message is partially corrupt, but it is necessary to get as much data as possible out of the
corrupt message. However, be aware that a MDC protection failure may also mean that the message
was tampered with intentionally by an attacker.
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--no-default-keyring
Do not add the default keyrings to the list of keyrings. Note that GnuPG will not operate without
any keyrings, so if you use this option and do not provide alternate keyrings via --keyring or
--secret-keyring, then GnuPG will still use the default public or secret keyrings.
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--skip-verify
Skip the signature verification step. This may be used to make the decryption faster if the
signature verification is not needed.
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--with-key-data
Print key listings delimited by colons (like --with-colons) and print the public key data.
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--fast-list-mode
Changes the output of the list commands to work faster; this is achieved by leaving some parts
empty. Some applications don't need the user ID and the trust information given in the listings.
By using this options they can get a faster listing. The exact behaviour of this option may change
in future versions. If you are missing some information, don't use this option.
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--no-literal
This is not for normal use. Use the source to see for what it might be useful.
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--set-filesize
This is not for normal use. Use the source to see for what it might be useful.
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--show-session-key
Display the session key used for one message. See --override-session-key for the counterpart of
this option.
We think that Key Escrow is a Bad Thing; however the user should have the freedom to decide
whether to go to prison or to reveal the content of one specific message without compromising all
messages ever encrypted for one secret key. DON'T USE IT UNLESS YOU ARE REALLY FORCED TO DO SO.
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--override-session-key string
Don't use the public key but the session key string. The format of this string is the same as the
one printed by --show-session-key. This option is normally not used but comes handy in case
someone forces you to reveal the content of an encrypted message; using this option you can do
this without handing out the secret key.
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--ask-sig-expire
--no-ask-sig-expire
When making a data signature, prompt for an expiration time. If this option is not specified, the
expiration time set via --default-sig-expire is used. --no-ask-sig-expire disables this option.
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--default-sig-expire
The default expiration time to use for signature expiration. Valid values are "0" for no
expiration, a number followed by the letter d (for days), w (for weeks), m (for months), or y (for
years) (for example "2m" for two months, or "5y" for five years), or an absolute date in the form
YYYY-MM-DD. Defaults to "0".
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--ask-cert-expire
--no-ask-cert-expire
When making a key signature, prompt for an expiration time. If this option is not specified, the
expiration time set via --default-cert-expire is used. --no-ask-cert-expire disables this option.
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--default-cert-expire
The default expiration time to use for key signature expiration. Valid values are "0" for no
expiration, a number followed by the letter d (for days), w (for weeks), m (for months), or y (for
years) (for example "2m" for two months, or "5y" for five years), or an absolute date in the form
YYYY-MM-DD. Defaults to "0".
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--allow-secret-key-import
This is an obsolete option and is not used anywhere.
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--allow-multiple-messages
--no-allow-multiple-messages
Allow processing of multiple OpenPGP messages contained in a single file or stream. Some programs
that call GPG are not prepared to deal with multiple messages being processed together, so this
option defaults to no. Note that versions of GPG prior to 1.4.7 always allowed multiple messages.
Warning: Do not use this option unless you need it as a temporary workaround!
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--enable-special-filenames
This options enables a mode in which filenames of the form `-&n', where n is a non-negative
decimal number, refer to the file descriptor n and not to a file with that name.
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--no-expensive-trust-checks
Experimental use only.
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--preserve-permissions
Don't change the permissions of a secret keyring back to user read/write only. Use this option
only if you really know what you are doing.
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--default-preference-list string
Set the list of default preferences to string. This preference list is used for new keys and
becomes the default for "setpref" in the edit menu.
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--default-keyserver-url name
Set the default keyserver URL to name. This keyserver will be used as the keyserver URL when
writing a new self-signature on a key, which includes key generation and changing preferences.
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--list-config
Display various internal configuration parameters of GnuPG. This option is intended for external
programs that call GnuPG to perform tasks, and is thus not generally useful. See the file
`doc/DETAILS' in the source distribution for the details of which configuration items may be
listed. --list-config is only usable with --with-colons set.
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--gpgconf-list
This command is similar to --list-config but in general only internally used by the gpgconf tool.
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--gpgconf-test
This is more or less dummy action. However it parses the configuration file and returns with
failure if the configuration file would prevent gpg from startup. Thus it may be used to run a
syntax check on the configuration file.
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--load-extension name
Load an extension module. If name does not contain a slash it is searched for in the directory
configured when GnuPG was built (generally "/usr/local/lib/gnupg"). Extensions are not generally
useful anymore, and the use of this option is deprecated.
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--show-photos
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--no-show-photos
Causes --list-keys, --list-sigs, --list-public-keys, --list-secret-keys, and verifying a signature
to also display the photo ID attached to the key, if any. See also --photo-viewer. These options
are deprecated. Use --list-options [no-]show-photos and/or --verify-options [no-]show-photos
instead.
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--show-keyring
Display the keyring name at the head of key listings to show which keyring a given key resides on.
This option is deprecated: use --list-options [no-]show-keyring instead.
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--ctapi-driver file
Use file to access the smartcard reader. The current default is `libtowitoko.so'. Note that the
use of this interface is deprecated; it may be removed in future releases.
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--always-trust
Identical to --trust-model always. This option is deprecated.
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--show-notation
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--no-show-notation
Show signature notations in the --list-sigs or --check-sigs listings as well as when verifying a
signature with a notation in it. These options are deprecated. Use --list-options [no-]show-
notation and/or --verify-options [no-]show-notation instead.
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--show-policy-url
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--no-show-policy-url
Show policy URLs in the --list-sigs or --check-sigs listings as well as when verifying a signature
with a policy URL in it. These options are deprecated. Use --list-options [no-]show-policy-url
and/or --verify-options [no-]show-policy-url instead.
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