keyctl:tldr:7150b

The command "keyctl revoke ${key_name}" is used to revoke a key in the Linux key management system.

In Linux, the key management system allows users and processes to manage keys securely. Keys are used to store confidential information such as encryption keys, authentication tokens, or any other sensitive data.

The "keyctl revoke" command revokes a specific key identified by its name (specified as ${key_name} in the command). When a key is revoked, it becomes invalid and can no longer be used for any purpose. Any processes that have accessed or used this key will be unable to access it further.

Revoking a key ensures that even if an attacker gains access to the system, they will not be able to use any revoked keys to access sensitive information.

Note that revoking a key does not delete it from the key management system. The key is still present in the keyring, but it is marked as revoked and cannot be used. To completely remove a key, the "keyctl unlink" command can be used.