Pretty Good Privacy

a program used for digitally signing and encrypting data, but especially email.

This is part of a Public Key Infrastructure (see PKI), using PublicKeyEncryption.

There is an inter-operable open-source (ok, free software...) version called GPG.

For notes on how to use these programs, see GPG/PGPNotes

PGPCorporation, a commercial company that sells PGP software and services and runs the PGPGlobalDirectory, sometimes trades a PGP.

Part of CategorySecurity