This is the portable OTR Messaging Library, as well as the toolkit to
help you forge messages.
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.