GnuPG
The GNU Privacy Guard is a
"...complete and free implementation of the OpenPGP standard." It
allows you "...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. A wealth of frontend applications and libraries are
available."
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