Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures

This specification has been revised 3 times since RFC 989 (1987). Each document below formally obsoleted the one before it; the versions still in force are listed first.

This lineage is derived automatically from the “obsoletes” relationships recorded in the public RFC Editor index — no editorial judgement is applied to the ordering. The most recent document in the chain is RFC 1421 (February 1993).