arc is an ASN.1 compiler written by FORGE Research for use in internal projects. It is being released under a BSD-like licence. arc creates Java source code that uses the basic ASN.1 classes that were created for use with other FORGE projects. These basic ASN.1 classes are included in the arc distribution.
PGP (Pretty Good Privacy) is a public key encryption program originally written by Phil Zimmermann in 1991. Later PGP versions have been developed and distributed by MIT, ViaCrypt, PGP Inc., and now Network Associates Inc. (NAI). PGP is the de-facto standard for email encryption today, with millions of users worldwide.