pidgin-otr: pidgin-otr (Off-the-Record (OTR) Messaging for Pidgin)
pidgin-otr: 
pidgin-otr: Allows you to have private conversations over instant messaging when
pidgin-otr: talking on Pidgin by providing:
pidgin-otr: - Encryption: No one else can read your instant messages.
pidgin-otr: - Authentication: You are assured the correspondent is who you
pidgin-otr: think it is.
pidgin-otr: - Deniability: The messages you send do not have digital
pidgin-otr: signatures that are checkable by a third party.
pidgin-otr: - Perfect forward secrecy
pidgin-otr: http://www.cypherpunks.ca/otr/