sq-key-subkey - Man Page

Add a new subkey to a certificate.

A subkey has one or more capabilities.

`--can-sign` sets the signing capability, and means that the key may be used for signing. `--can-authenticate` sets the authentication capability, and means that the key may be used for authentication (e.g., as an SSH key).  `--can-certify` sets the certificate capability, and means that the key may be used to make third-party certifications.  These capabilities may be combined.

`--can-encrypt=storage` sets the storage encryption capability, and means that the key may be used for storage encryption. `--can-encrypt=transport` sets the transport encryption capability, and means that the key may be used for transport encryption.  `--can-encrypt=universal` sets both the storage and the transport encryption capability, and means that the key may be used for both storage and transport encryption.  The encryption capabilities must not be combined with the signing or authentication capability.

When using `--with-password`, `sq` prompts the user for a password that is used to encrypt the subkey.  The password for the new subkey may be different from the other keys.

By default a new subkey doesn't expire on its own.  However, its validity period is limited by that of the certificate.  Using the `--expiration` argument allows setting a different expiration time.

`sq key subkey add` respects the reference time set by the top-level `--time` argument.  It sets the creation time of the subkey to the specified time.

Change a subkey's expiration time.

This subcommand changes a key's expiration time.  To change the expiration time of the certificate, use the `sq key expire` subcommand.

Changing the expiration time of the primary key is equivalent to changing the certificate's expiration time.

Revoke a subkey.

Creates a revocation certificate for a subkey.

If `--revoker` or `--revoker-file` is provided, then that key is used to create the revocation certificate.  If that key is different from the certificate that is being revoked, this results in a third-party revocation.  This is normally only useful if the owner of the certificate designated the key to be a designated revoker.

`sq key subkey revoke` respects the reference time set by the top-level `--time` argument.  When set, it uses the specified time instead of the current time when determining what keys are valid, and it sets the revocation certificate's creation time to the reference time instead of the current time.

Import Alice's key.

    sq key import alice-secret.pgp

Add a new signing-capable subkey.

    sq key subkey add --can-sign --cert \
    EB28F26E2739A4870ECC47726F0073F60FD0CBF0

Import Alice's key.

    sq key import alice-secret.pgp

Make Alice's authentication subkey expire in 6 months.

    sq key subkey expire 6m --cert \
    EB28F26E2739A4870ECC47726F0073F60FD0CBF0 --key \

Import Alice's key.

    sq key import alice-secret.pgp

Alice revokes her signing subkey.

    sq key subkey revoke --cert \
    EB28F26E2739A4870ECC47726F0073F60FD0CBF0 \