If your subkey has been compromised or is no longer in use, it might be a good idea to revoke it to prevent misuse of the key.
Navigate to the Subkeys panel.
Select the subkey from the list and press the Revoke button.
In the new dialog, select a reason for revoking the key. Optionally, describe your reason in more detail in the Description field.
Press the Revoke button.
You will have to unlock the key with its passphrase.
The Status of the subkey changes to Revoked in the Subkeys panel.
If you have published your subkey, you must synchronize it with the key servers after revoking it to apply the revocation on all copies of the key.
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