| | PGP - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07) |
 | | PGP has also always included a way to cancel ('revoke') identity certificates which may have become invalid; this is, more or less, equivalent to the certificate revocation lists of more centralized PKI schemes. |
 | | PGP's original scheme, at least, leaves the decision whether or not to use its endorsement/vetting system to the user, while most other PKI schemes do not, requiring instead that every certificate attested to by a central certificate authority be accepted as correct. |
 | | PGP 2.x is not forward compatible in that it cannot in general make any use of messages or keys in the OpenPGP format (although OpenPGP implementations may include facilities to interoperate with older implementations). |
| en.wikipedia.org /wiki/PGP (4921 words) |