Menlo Park-based PGP Corporation, the developer of email and data encryption software, said today that it is in a definitive agreement to acquired TC TrustCenter and parent firm ChosenSecurity. Financial terms of the deal were not disclosed. TC TrustCenter is based in Germany, and ChosenSecurity is based in Newton, Massachusetts. Both firms provide software for managing encryption, authentication, and secure communications. PGP said it will both continue to support ChosenSecurity and TC TrustCenter's existing products, as well as incorporate their offerings into PGP's product line.