Off-the-Record Messaging Provides Private Conversations Over IM

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Off-the-Record (OTR) Messaging allows you to have private conversations over instant messaging by providing encryption, authentication, deniability, and perfect forward secrecy. If you lose control of your private keys, no previous conversation is compromised.

http://www.cypherpunks.ca/otr/
http://sourceforge.net/projects/otr/

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