PGP has always included provisions for revocation. The RFC [1] isn't exactly light reading, but this overview [2] is helpful. [1] http://tools.ietf.org/html/r

PGP has always included provisions for revocation. The RFC [1] isn't exactly light reading, but this overview [2] is helpful. [1] http://tools.ietf.org/html/rfc4880 http://tools.ietf.org/html/rfc4880 [2] http://www.openpgp.org/technical/whybetter.shtml http://www.openpgp.org/technical/whybetter.shtml