(RIPEM) A (not yet complete, but useful) implementation of Privacy Enhanced Mail (PEM). RIPEM allows your electronic mail to have the four security facilities provided by PEM: disclosure protection (optional), originator authenticity, message integrity measures and non-repudiation of origin (always).
RIPEM was written primarily by Mark Riordan firstname.lastname@example.org. Most of the code is in the public domain, except for the RSA routines, which are a library called RSAREF licensed from RSA Data Security, Inc.
The current (November 1993) version of RIPEM is 1.1a; the current version of the Macintosh port of RIPEM is 0.8b1.