IACR News item: 02 June 2013
Michael Z. Lee, Alan M. Dunn, Jonathan Katz, Brent Waters, Emmett Witchel
ePrint ReportWe find that a central tension in an anonymous subscription service is the service provider\'s desire for a long epoch (to reduce server-side computation) versus users\' desire for a short epoch (so they can repeatedly \"re-anonymize\" their sessions). We balance this tension by having short epochs, but adding an efficient operation for clients who do not need unlinkability to cheaply re-authenticate themselves for the next time period.
We measure performance of a research prototype of our pro- tocol that allows an independent service to offer anonymous access to existing services. We implement a music service, an Android-based subway-pass application, and a web proxy, and show that adding anonymity adds minimal client latency and only requires 33 KB of server memory per active user.
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