A key can no longer be used to perform key operations after it has expired. Changing a key's expiration date to a point in the future re-enables it. A good general practice would be to have a master key that never expires and multiple subkeys that do and are signed by the master key.
Gako bat iraungita baldin badago, ezingo da gehiago erabili. Gako baten iraungitze-data luzatzean, berriro ere aktibatzen da. Onena litzake inoiz iraungitzen ez den gako maisu bat izatea eta gako horrekin sinatutako zenbait azpigako izatea.