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  • Online, Accessed Jan. 2015.


ST1: Secure Instant messaging

Tutor: Sandeep Tamrakar

Instant messaging (IM) is the most widely used communication over the Internet generally used for sending short messages. Popular IMs communicates over TLS to protect against eavesdropping yet the TLS does not guarantee against eavesdropping at the server end. There are number of IM services that provides end-to-end secure messaging such as TextSecure. Similarly BitTorrent recently released decentralized private chat application known as Bleep. Off-the-record messaging protocol developed by Goldberg et. al. [1] describe secure messaging protocol with deniability, which ensures the authenticity of the message during communication yet it allows anyone to forge messages after the conversation that look like they were real communication between the participants.

The goal of this work is to look at different secure IM services and protocols, and make a survey based on the security features that these IM offers.


  • Borisov, Nikita, Ian Goldberg, and Eric Brewer. "Off-the-record communication, or, why not to use PGP." Proceedings of the 2004 ACM workshop on Privacy in the electronic society. ACM, 2004.
  • Bleep: private chat
  • TextSecure

TN1: Survey of security-enhanced linux policy analysis techniques