Pretty Good Privacy
PGP RFC 1991: PGP Message Exchange Formats
OpenPGP RFC 2440: OpenPGP Message Format RFC 4880: OpenPGP Message Format RFC 5581: The Camellia Cipher in OpenPGP RFC 6637: Elliptic Curve Cryptography (ECC) in OpenPGP draft-ietf-openpgp-crypto-refresh OpenPGP Message Format
PGP/MIME RFC 2015: MIME Security with Pretty Good Privacy (PGP) RFC 3156: MIME Security with OpenPGP