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Ruby library which generates attr_accessors that encrypt and decrypt attributes transparently

Barebones two-factor authentication with Devise

A simple wrapper for the standard ruby OpenSSL library to encrypt and decrypt strings

cmd5checkpw is a checkpassword compatible authentication program that uses CRAM-MD5 authentication mode. It was designed primary to work with qmail but it can be used by any other program that knows how to use checkpassword compatible authentication.

GnuPG is a complete and free replacement for PGP. Because it does not use the patented IDEA algorithm, it can be used without any restrictions. GnuPG is an RFC2440 (OpenPGP) compliant application. kuriyama@FreeBSD.org

Encryption plugin for Pidgin instant messaging client.

Off-the-Record (OTR) Messaging allows you to have private conversations over instant messaging by providing: * Encryption No one else can read your instant messages. * Authentication You are assured the correspondent is who you think it is. * Deniability The messages you send do not have digital signatures that are checkable by a third party. Anyone can forge messages after a conversation to make them look like they came from you. However, during a conversation, your correspondent is assured the messages he sees are authentic and unmodified. * Perfect forward secrecy If you lose control of your private keys, no previous conversation is compromised.