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.