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The Double Ratchet Algorithm is a protocol (similar to OTR) that provides for perfect forward secrecy in (a)synchronous communications. It uses triple Diffie-Hellman for authentication and ECDHE for perfect forward secrecy. The protocol is lighter and more robust than the OTR protocol - providing better forward and future secrecy, as well as deniability. The protocol was developed by Trevor Perrin and Moxie Marlinspike. Its chief use currently is in the Open Whisper Systems Signal package.