[Resource Topic] 2008/528: Encrypting Proofs on Pairings and Its Application to Anonymity for Signatures

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Title:
Encrypting Proofs on Pairings and Its Application to Anonymity for Signatures

Authors: Georg Fuchsbauer, 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.

ePrint: https://eprint.iacr.org/2008/528

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