CIS seminar
Speaker: Mira Belenkiy , Brown University
Date: December 7 2007
Time: 10:30AM to 12:00PM
Location: 32-G449
Contact: Be Blackburn, 3-6098, imbe@mit.edu
Relevant URL:
We give the first construction of a practical non-interactive anonymous credential system whose security does not rely on the random oracle model. We introduce P-signatures (Signatures with efficient Protocols) as our main building block. A P-signature scheme consists of a signature scheme, a commitment scheme, and
(1) an interactive protocol for obtaining a signature on a committed value;
(2) a non-interactive proof system for proving that the contents of a commitment has been signed;
(3) a non-interactive proof system for proving that a pair of commitments are commitments to the same value. P-signatures are a powerful tool that may serve as a useful building block for other privacy-preserving authentication mechanisms.
Our constructions makes extensive use of the recently developed Groth-Sahai proof system. We present some new notation that makes it easier to use Groth-Sahai proofs as a building block, which may be of independent interest.
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