gnupg.org

GnuPG is a free and complete implementation of the OpenPGP standard. It's used for encrypting and signing data and communications. GnuPG features a key management system and access modules for public key directories. It's a command-line tool, but also integrates with other applications via frontends and libraries. GnuPG supports S/MIME and Secure Shell (ssh). The software is free software, meaning it can be freely used, modified, and distributed under the terms of the GNU General Public License.

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