Pidgin is one of the best all-in-one instant messengers that supports MSN, Google Talk, Yahoo, AIM etc... Off-the-Record Messaging Plugin for Pidgin allows you to encrypt you conversations and provides security even when keys are compromised. It works on AES128-CTR encryption model.
Off-the-Record Messaging Plugin Features :
* 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.
Download Off-the-Record Messaging Plugin for Pidgin