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Encrypting Proofs on Pairings and Its Application to Anonymity for Signatures
Authors: Georg Fuchsbauer, David PointchevalAbstract:
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.
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