GnuPG is GNU's tool for secure communication and data storage.
It can be used to encrypt data and to create digital signatures.
It includes an advanced key management facility and is compliant
with the proposed OpenPGP Internet standard as described in RFC2440.

Because GnuPG does not use use any patented algorithms it is not
by default fully compatible with PGP 2.x, which uses the patented
IDEA algorithm.  See http://www.gnupg.org/why-not-idea.html for
more information on this subject, including what to do if you are
legally entitled to use IDEA.

The default public key algorithms are DSA and Elgamal, but RSA is
also supported.  Symmetric algorithms available are AES (with 128,
192, and 256 bit keys), 3DES, Blowfish, CAST5 and Twofish.  Digest
algorithms available are MD5, RIPEMD/160, SHA-1, SHA-256, SHA-384,
and SHA-512.  Compression algorithms available are ZIP, ZLIB, and
BZIP2.

• Maxim Tyurin
• Dmitry Marochko
• Dmitry V. Levin

• gnupg
• gnupg-ldap