Open PGP

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Open PGP is an IETF standard for the PGP email encryption system. The current version, as of late 2008, is RFC 4880 [1], Earlier versions were RFC 1991 and RFC 2440.

Supported public key algorithms are RSA, El Gamal (encrypt-only, not for signatures), and Digital Signature Algorithm. Supported block ciphers are IDEA, Triple DES, CAST-128, AES and Twofish.

Both the current commercial release [1] of PGP and the open source product GNU Privacy Guard (GPG) are based on this specification.


  1. J. Callas, L. Donnerhacke, H. Finney, D. Shaw and R. Thayer (November 2007). OpenPGP Message Format.