Gpg4win - Free GNU Privacy Guard for Email File Encryption

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Gpg4win is a GNU Privacy Guard installer package for Windows 2000,XP,2003 and Vista for EMail and file encryption. Both relevant cryptography standards are supported, OpenPGP and S/MIME (the latter is in progress and currently works with GnuPG2 and Claws Mail).

The following are the software modules included in the Gpg4win software:

GnuPG: The core encryption tool
WinPT: A key manager and helper for various encryption matters
GPA: Another key manager, tasts are simply different
GPGol: A plugin for Microsoft Outlook 2003 (email encryption)
GPGee: A plugin for Microsoft Explorer (file encryption)
Claws Mail: A complete email program including the plugin for GnuPG

You can choose to exclude the optional programs included in the package.

GNU Privacy Guard is a complete replacement package for the commercial PGP encryption software build on the Open PGP standards. GnuPG allows to encrypt and sign your data and communication, features a versatile key managment system as well as access modules for all kind of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.

Key features of GNU Privacy Guard include

Complete replacement for PGP

Can be used as a filter program

Full OpenPGP implementation

Better functionality than PGP and some security enhancements over PGP 2
 
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.

Easy implementation of new algorithms using extension modules.

The User ID is forced to be in a standard format.

Supports key and signature expiration dates.

Multilanguage support

Optional anonymous message receivers.

Integrated support for HKP keyservers (wwwkeys.pgp.net).

Clears signed patch files which can still be processed by patch

To download and install Gpg4win, click here