Riordan's Internet Privacy Enhanced Mail
(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.