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Erschienen in:
2008 | OriginalPaper | Buchkapitel
P-signatures and Noninteractive Anonymous Credentials
verfasst von : Mira Belenkiy, Melissa Chase, Markulf Kohlweiss, Anna Lysyanskaya
Erschienen in: Theory of Cryptography
Verlag: Springer Berlin Heidelberg
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In this paper, we introduce P-signatures. 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 noninteractive proof system for proving that a pair of commitments are commitments to the same value. We give a definition of security for P-signatures and show how they can be realized under appropriate assumptions about groups with a bilinear map. We make extensive use of the powerful suite of non-interactive proof techniques due to Groth and Sahai. Our P-signatures enable, for the first time, the design of a practical non-interactive anonymous credential system whose security does not rely on the random oracle model. In addition, they may serve as a useful building block for other privacy-preserving authentication mechanisms.