[Resource Topic] 2006/193: (Hierarchical Identity-Based) Threshold Ring Signatures

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Title:
(Hierarchical Identity-Based) Threshold Ring Signatures

Authors: Victor K. Wei, Tsz Hon Yuen

Abstract:

We construct the first several efficient threshold ring signatures (TRS) without random oracles. Specializing to a threshold of one, they are the first several efficient ring signatures without random oracles after the only earlier instantiation of Chow, Liu, Wei, and Yuen. Further specializing to a ring of just one user, they are the short (ordinary) signatures without random oracles summarized in Wei and Yuen. We also construct the first hierarchical identity-based threshold ring signature without random oracles. The signature size is O(n\lambda_s) bits, where \lambda_s is the security parameter and n is the number of users in the ring. Specializing to a threshold of one, it is the first hierarchical identity-based ring signature without random oracles. Further specializing to a ring of one user, it is the constant-size hierarchical identity-based signature (HIBS) without random oracles in Yuen-Wei - the signature size is O(\lambda_s) bits which is independent of the number of levels in the hierarchy.

ePrint: https://eprint.iacr.org/2006/193

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