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Accumulators and U-Prove Revocation

Tolga Acar, Sherman S. M. Chow, and Lan Nguyen


This work introduces the most efficient universal accumula- tor known today. For the first time, we have an accumulator which does not depend on hidden order groups, does not require any exponentia- tions in the target group associated with the pairing function, and only requires two pairings to verify a proof-of-knowledge of a witness. We present implementations of our accumulator and another recent pro- posal utilizing Groth-Sahai proofs, with performance results. Our im- plementations are designed with cryptography agility in mind. We then build a library for revoking anonymous credentials using any accumula- tors, and integrated it with Microsoft U-Prove, which has a significant contribution to an European Union’s privacy standardization effort. Our work enables U-Prove revocation without compromising untraceability.


Publication typeInproceedings
Published inFinancial Cryptography'13
PublisherSpringer Verlag
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