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GNU PG treats software as a set of applications and cryptographic hardware of free implementation that does not use the patent algorithm IT DESIGNS, by what it can be used without restrictions. It is compatible with PGP (Pretty Good Privacy) and it expires with the specifications of the RFC2440 (OpenPGP). It is a question of an application of free software and it can be used freely, General GNU distributed and modified under the terms of the Public License.

The first version of this application software was published on September 7, 1999 and the current stable version is 1.4.7.

GnuPG, if the same, it is a utility of line of commands without any graphic characteristic. It is a question of an engine of coding that can be used straight from the line of commands, from programs shell (shell scripts) or from another type of programs. Therefore GnuPG can be considered to be an engine (backend) for other applications. Anyhow, even if it is used from the commands line, it provides the whole necessary functionality, what includes an interactive menus system. The set of orders of this tool will always be a superset with which it provides any user's interface (frontend). Between others, these are some of the carácterísticas of this application software:

a) Finished substitution of PGP.
b) It does not use patent algorithms.
c) It can be used like filter.
d) Finished implementation of OpenPGP (see RFC 2440 in Publishing RFC).
e) Functionality improved with regard to PGP and safety progress with regard to PGP 2.
f) It deciphers and verifies messages of PGP 5, 6 and 7.
g) ElGamal supports, DSA, RSA, AES, 3DES, Blowfish, Twofish, CAST5, MD5, SHA-1, RIPE-MD-160 and TIGER.
h) Facility of implementation of new algorithms using modules.
i) Force that the user's identifier (User ID) is in a standard format.
j) He supports dates of expiration of keys and signatures.
k) He supports English, Danish, Dutch, Esperanto, Estonian, French, German, Japanese, Italian, Polish, portuguese, Russian, Spanish, Swedish and Turkish.
l) Help system in line.
m) Support integrated for servants of keys HKP.
n) It cleans files signed with "he signs in skylight", that can be processed in lots.
o) He supports the operating systems GNU/Linux, GNU/Hurd, FreeBSD, OpenBSD, NetBSD, Windows 95/98/NT / 2000/me / XP.