File Formats Used by PGP 2.x : from the PGP 2.6.3i distribution
- RFC 1991 : PGP Message Exchange Formats (Aug 1996) - covers PGP 2.x
- RFC 2015 : MIME Security with Pretty Good Privacy (Oct 1996)
- RFC 2440 : OpenPGP Message Format (Nov 1998) - current standard
- S/MIME and OpenPGP : information from the Internet Mail Consortium (IMC)
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