Cryptology ePrint Archive: Report 2008/528

Encrypting Proofs on Pairings and Its Application to Anonymity for Signatures

Georg Fuchsbauer and David Pointcheval

Abstract: We give a generic methodology to unlinkably anonymize cryptographic schemes in bilinear groups using the Boneh-Goh-Nissim cryptosystem and NIZK proofs in the line of Groth, Ostrovsky and Sahai. We illustrate our techniques by presenting the first instantiation of anonymous proxy signatures, a recent primitive unifying the functionalities and strong security notions of group and proxy signatures. To construct our scheme, we introduce various efficient NIZK and witness-indistinguishable proofs, and a relaxed version of simulation soundness.

Category / Keywords: public-key cryptography / NIZK, bilinear groups, anonymity, unlinkability, group signatures, non-frameability

Date: received 17 Dec 2008

Contact author: fuchsbau at di ens fr

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Version: 20081219:223537 (All versions of this report)

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