This document describes the format of PGP 2.x files, i.e., messages that have been encrypted and/or signed with PGP. Replaced by RFC 2440. ftp://ftp.isi.edu/in-notes/rfc1991.txt
This document describes how Pretty Good Privacy (PGP) can be used to provide privacy and authentication using the Multipurpose Internet Mail Extensions (MIME) security content types described in RFC1847. (M. Elkins / Aerospace Corporation) ftp://ftp.isi.edu/in-notes/rfc2015.txt