GNU Privacy Guard

• GPL'ed implementation of OpenPGP

• Free of Patent restrictions

  • Doesn't support IDEA algorithm

• Interoperates with PGP

• Supports many encryption algorithms

  • DSA, RSA, DES, 3DES, AES, MD5, SHA-1 ...

• Integrates with many E-mail clients

  • Mutt, Pine (pinepgp), KMail, Evolution, Netscape/Mozilla (Enigmail)