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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://www.cert.org/advisories/CA-2000-18.html" target="_top">CA-2000-18: PGP May Encrypt Data With Unauthorized ADKs</a> - Additional Decryption Keys (ADKs) is a feature of PGP (Pretty Good Privacy) that allows authorized extra decryption keys to be added to a user's public key certificate. However, an implementation flaw in PGP allows unsigned ADKs which have been maliciously added to a certificate to be used for encryption.