By Dan Boneh (auth.), Xiaoyun Wang, Kazue Sako (eds.)
This booklet constitutes the refereed complaints of the 18th overseas convention at the thought and alertness of Cryptology and knowledge safety, Asiacrypt 2012, held in Beijing, China, in December 2012. The forty three complete papers provided have been rigorously reviewed and chosen from 241 submissions. they're equipped in topical sections named: public-key cryptography, beginning, symmetric cipher, safeguard facts, lattice-based cryptography and quantity conception, hash functionality, cryptographic protocol, and implementation issues.
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Additional resources for Advances in Cryptology – ASIACRYPT 2012: 18th International Conference on the Theory and Application of Cryptology and Information Security, Beijing, China, December 2-6, 2012. Proceedings
If an attacker is only given oracle access to SignA , then it is hard to create any forgery that is not of Type I. B-II Matching. If an attacker is only given oracle access to SignB , then it is hard to create any forgery that is not of Type II. Dual-Oracle Invariance. If an attacker is given oracle access to both SignA and SignB and a “challenge signature” which is either from SignA or SignB , the attacker’s probability of producing a Type I forgery is approximately the same when the challenge signature is from SignA as when the challenge signature is from SignB .
Type I and II forgeries roughly mirror signatures of form A and B. The veriﬁcation procedure in our scheme will verify that the signature is well formed in the Gp1 subgroup, but not “check” the other subgroups. We prove security in the dual form framework based on three static subgroup decision-type assumptions, similar to those used in . The most challenging part of the proof is dual-oracle invariance, which we prove by developing a backdoor veriﬁcation test (performed by the simulator) which acts as an almostperfect distinguisher between forgery types.
SIG1 is a structure-preserving signature scheme that yields constant-size signatures, and is UF-CMA under the DLIN assumption. t. t. algorithm B cma dlin such that AdvufSIG1,A (λ) ≤ (qs + 3) · AdvG,B (λ) + 1/p. Constant-Size Structure-Preserving Signatures under Simple Assumptions 19 6 Instantiating SIG2 We instantiate the POS and xSIG building blocks of our second generic construction to obtain our second SPS scheme. Here we choose the Type-III bilinear group setting. The resulting SIG2 scheme is an efficient structure-preserving signature scheme based on SXDH and XDLIN.