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Vote for GNU Privacy Guard
GnuPG itself is a commandline tool without any graphical stuff. It is the real crypto engine which can be used directly from a command prompt, from shell scripts or by other programs. Therefore it can be considered as a backend for other applications. Features include: Full replacement of PGP; Does not use any patented algorithms; GPLed, written from scratch; Can be used as a filter program; Full OpenPGP implementation; Decrypts and verifies PGP 5, 6 and 7 messages; Supports ElGamal, DSA, RSA, AES, 3DES, Blowfish, Twofish, CAST5, MD5, SHA-1, RIPE-MD-160 and TIGER; The User ID is forced to be in a standard format; Supports key and signature expiration dates; English, Danish, Dutch, Esperanto, Estonian, French, German, Japanese, Italian, Polish, Portuguese (Brazilian), Portuguese (Portuguese), Russian, Spanish, Swedish and Turkish language support; Online help system; Optional anonymous message receivers; Integrated support for HKP keyservers (wwwkeys.pgp.net); Clears signed patch files which can still be processed by patch.