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Practical Round-Optimal Blind Signatures in the Standard Model from Weaker Assumptions

Abstract : At Crypto'15 Fuchsbauer, Hanser and Slamanig (FHS) presented the first standard-model construction of efficient round-optimal blind signatures that does not require complexity leveraging. It is conceptually simple and builds on the primitive of structure-preserving signatures on equivalence classes (SPS-EQ). FHS prove the unforgeability of their scheme assuming EUF-CMA security of the SPS-EQ scheme and hardness of a version of the DH inversion problem. Blindness under adversarially chosen keys is proven under an interactive variant of the DDH assumption. We propose a variant of their scheme whose blindness can be proven under a non-interactive assumption, namely a variant of the bilinear DDH assumption. We moreover prove its unforgeability assuming only unforgeability of the underlying SPS-EQ but no additional assumptions as needed for the FHS scheme.
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Contributor : Georg Fuchsbauer <>
Submitted on : Wednesday, October 19, 2016 - 6:00:32 PM
Last modification on : Tuesday, September 22, 2020 - 3:47:52 AM




Georg Fuchsbauer, Christian Hanser, Chethan Kamath, Daniel Slamanig. Practical Round-Optimal Blind Signatures in the Standard Model from Weaker Assumptions. Security and Cryptography for Networks - 10th International Conference, SCN 2016, Aug 2016, Amalfi, Italy. ⟨10.1007/978-3-319-44618-9_21⟩. ⟨hal-01384381⟩



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