March 3, 2006:
URL: http://www.cypherpunks.ca/otr/
PDF: http://www.cypherpunks.ca/otr/otr-wpes.pdf
Title: Off-the-Record Communication, or, Why Not To Use PGP
Author: Nikita Borisov, Ian Goldberg, Eric Brewer
Ref: Workshop on Privacy in the Electronic Society, October 2004