A subset implementation of the proposed Privacy Enhanced Mail standard. Not as secure as PGP or Viacrypt PGP, but it is both free and free of patent infringements in the USA.

I just recently got MacRipem and find it much easier to use than PGP, and was wondering why I should use PGP over Ripem. The above seems to indicate that Ripem isn't as secure. Why is this?

Bruce Schneier's (excellent!) book states that the only info available to someone cryptanalyzing a pgp-encrypted file is the six-digit key ID. PEM "leaves quite a bit of information about the sender, recipient, and message in the unencrypted header." (p. 436) Alan Westrope <awestrop@nyx10.cs.du.edu> KeyID: 359639 <adwestro@ouray.denver.colorado.edu> PGP fingerprint: D6 89 74 03 77 C8 2D 43 7C CA 6D 57 29 25 69 23 finger for public key -- "Ah, ah...see them there! Like Gorgons, with gray cloaks, and snakes coiled swarming round their bodies! Let me go!" -- Aeschylus, _The Choephori_ (4larry...:-)