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The RFC 2440 describes a deprecated version of the OpenPGP Message Format. It was edited in 1998 and was updated by RFC 4880 in 2007.
https://datatracker.ietf.org/doc/html/rfc2440
Critical Commentary
The RFC 2440 describes a deprecated version of the OpenPGP Message Format. It was edited in 1998 and was updated by RFC 4880 in 2007.