_Crypt::OpenPGP_ is a pure-Perl implementation of the OpenPGP standard. In addition to support for the standard itself, _Crypt::OpenPGP_ claims compatibility with many other PGP implementations, both those that support the standard and those that preceded it.

_Crypt::OpenPGP_ provides signing/verification, encryption/decryption, keyring management, and key-pair generation; in short it should provide you with everything you need to PGP-enable yourself. Alternatively it can be used as part of a larger system; for example, perhaps you have a web-form-to-email generator written in Perl, and you'd like to encrypt outgoing messages, because they contain sensitive information. _Crypt::OpenPGP_ can be plugged into such a scenario, given your public key, and told to encrypt all messages; they will then be readable only by you.

This module currently supports 'RSA' and 'DSA' for digital signatures, and 'RSA' and 'ElGamal' for encryption/decryption. It supports the symmetric ciphers '3DES', 'Blowfish', 'IDEA', 'Twofish', 'CAST5', and 'Rijndael' ('AES'). 'Rijndael' is supported for key sizes of '128', '192', and '256' bits. _Crypt::OpenPGP_ supports the digest algorithms 'MD5', 'SHA-1', and 'RIPE-MD/160'. And it supports 'ZIP' and 'Zlib' compression.