----- Forwarded message from Steve Weis <steveweis@gmail.com> ----- Date: Wed, 18 Sep 2013 08:50:09 -0700 From: Steve Weis <steveweis@gmail.com> To: "liberationtech@lists.stanford.edu" <liberationtech@lists.stanford.edu> Subject: [liberationtech] "Ibis: An Overlay Mix Network for Microblogging" by Ian Goldberg Reply-To: liberationtech <liberationtech@lists.stanford.edu> Ian Goldberg is speaking about "Ibis: An Overlay Mix Network for Microblogging" today at the Stanford security seminar. The talk is 4:30pm in the Gates building, room 463A. http://crypto.stanford.edu/seclab/sem-12-13/goldberg.html Abstract: Microblogging services such as Twitter are extremely popular. While they are commonly used by people who wish to reveal their names and friends to the world, some users, such as activists on the ground, may wish to be able to post without automatically revealing their identities or locations. An obvious approach is to use a low-latency anonymity system, such as Tor. However, low-latency systems fall prey to end-to-end timing attacks easily accomplished by an ISP or a government monitoring clients while also watching for posts to appear in real time on the microblogging site. We present Ibis, a high-latency mix network designed specifically for microblogging. Ibis is an overlay network: the mix nodes can be microblogging clients that come online only sporadicly, and the intermediate encrypted messages are themselves posted as microblogged entries. We accomplish this through a novel cryptographic mix message format that uses only 47 bytes of overhead, while maintaining three-hop, 128-bit security against offline attack. This is joint work with Paul Hendry. Bio: Ian Goldberg is an Associate Professor of Computer Science and a University Research Chair at the University of Waterloo, where he is a founding member of the Cryptography, Security, and Privacy (CrySP) research group. He holds a Ph.D. from the University of California, Berkeley, where he discovered serious weaknesses in a number of widely deployed security systems, including those used by cellular phones and wireless networks. He also studied systems for protecting the personal privacy of Internet users, which led to his role as Chief Scientist at Zero-Knowledge Systems (now Radialpoint). His research currently focuses on developing usable and useful technologies to help Internet users maintain their security and privacy. He is a Senior Member of the ACM and a winner of the Early Researcher Award, the Outstanding Young Computer Science Researcher Award, and the Electronic Frontier Foundation's Pioneer Award. -- Liberationtech is public & archives are searchable on Google. Violations of list guidelines will get you moderated: https://mailman.stanford.edu/mailman/listinfo/liberationtech. Unsubscribe, change to digest, or change password by emailing moderator at companys@stanford.edu. ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://ativel.com http://postbiota.org AC894EC5: 38A5 5F46 A4FF 59B8 336B 47EE F46E 3489 AC89 4EC5