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SQ(1) User Commands SQ(1)

NAME

sq verify - Verifies signed messages or detached signatures

SYNOPSIS

sq verify [OPTIONS] FILE

DESCRIPTION

Verifies signed messages or detached signatures.

When verifying signed messages, the message is written to stdout or the file given to `--output`.

When a detached message is verified, no output is produced. Detached signatures are often used to sign software packages.

Verification is only successful if there is no bad signature, and the number of successfully verified signatures reaches the threshold configured with the `--signatures` parameter. If the verification fails, the program terminates with an exit status indicating failure. In addition to that, the last 25 MiB of the message are withheld, i.e. if the message is smaller than 25 MiB, no output is produced, and if it is larger, then the output will be truncated.

A signature is considered to have been authenticated if the signer can be authenticated. If the signer is provided via `--signer-file`, then the signer is considered authenticated. Otherwise, the signer is looked up and authenticated using the Web of Trust. If at least one User ID can be fully authenticated, then the signature is considered to have been authenticated. If the signature includes a Signer User ID subpacket, then only that User ID is considered. Note: the User ID need not be self signed.

The converse operation is `sq sign`.

If you are looking for a standalone program to verify detached signatures, consider using sequoia-sqv.

`sq verify` respects the reference time set by the top-level `--time` argument. When set, it verifies the message as of the reference time instead of the current time.

OPTIONS

Subcommand options

Verifies a detached signature
Sets the threshold of valid signatures to N. If this threshold is not reached, the message will not be considered verified.
Writes to FILE or stdout if omitted
Verifies signatures using the specified certificate. This reads the certificate from the certificate store, and considers it to be authenticated. When this option is not provided, the certificate is still read from the certificate store, if it exists, but it is not considered authenticated.
Verifies signatures using the certificate in CERT_FILE
Reads from FILE or stdin if omitted

Global options

Specifies the location of the certificate store. By default, sq uses the OpenPGP certificate directory at `$HOME/.local/share/pgp.cert.d`, and creates it if it does not exist.
Overwrites existing files
Print help (see a summary with '-h')
Specifies the location of a keyring to use. Keyrings are used in addition to any certificate store. The content of the keyring is not imported into the certificate store. When a certificate is looked up, it is looked up in all keyrings and any certificate store, and the results are merged together.
Adds NOTATION to the list of known notations. This is used when validating signatures. Signatures that have unknown notations with the critical bit set are considered invalid.
Disables the use of a certificate store. Normally sq uses the user's standard cert-d, which is located in `$HOME/.local/share/pgp.cert.d`.
Produces output in FORMAT, if possible
Produces output variant VERSION, such as 0.0.0. The default is the newest version. The output version is separate from the version of the sq program. To see the current supported versions, use output-versions subcommand.
Specifies the location of a pEp certificate store. sq does not use a pEp certificate store by default; it must be explicitly enabled using this argument or the corresponding environment variable, PEP_CERT_STORE. The pEp Engine's default certificate store is at `$HOME/.pEp/keys.db`.
Sets the reference time as an ISO 8601 formatted timestamp. Normally, commands use the current time as the reference time. This argument allows the user to use a difference reference time. For instance, when creating a key using `sq key generate`, the creation time is normally set to the current time, but can be overridden using this option. Similarly, when verifying a message, the message is verified with respect to the current time. This option allows the user to use a different time.
TIME is interpreted as an ISO 8601 timestamp. To set the certification time to July 21, 2013 at midnight UTC, you can do:
$ sq --time 20130721 verify msg.pgp
To include a time, say 5:50 AM, add a T, the time and optionally the timezone (the default timezone is UTC):
$ sq --time 20130721T0550+0200 verify msg.pgp

Considers the specified certificate to be a trust root. Trust roots are used by trust models, e.g., the Web of Trust, to authenticate certificates and User IDs.
Be more verbose.

EXAMPLES

Verify a signed message

sq verify signed-message.pgp

Verify a detached message

sq verify --detached message.sig message.txt

Verify a message as of June 9, 2011 at midnight UTC:

sq verify --time 20130721 msg.pgp

SEE ALSO

sq(1).

For the full documentation see <https://book.sequoia-pgp.org>.

VERSION

0.33.0 (sequoia-openpgp 1.17.0)

0.33.0 Sequoia-PGP