Cryptology ePrint Archive: Report 2008/475

Sphinx: A Compact and Provably Secure Mix Format

George Danezis and Ian Goldberg

Abstract: Sphinx is a cryptographic message format used to relay anonymized messages within a mix network. It is more compact than any comparable scheme, and supports a full set of security features: indistinguishable replies, hiding the path length and relay position, as well as providing unlinkability for each leg of the message's journey over the network. We prove the full cryptographic security of Sphinx in the random oracle model, and we describe how it can be used as an efficient drop-in replacement in deployed remailer systems.

Category / Keywords: cryptographic protocols / anonymity

Date: received 10 Nov 2008

Contact author: iang+eprint at cs uwaterloo ca

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Version: 20081118:204739 (All versions of this report)

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