By Rosario Gennaro, Matthew Robshaw
The volume-set, LNCS 9215 and LNCS 9216, constitutes the refereed complaints of the thirty fifth Annual overseas Cryptology convention, CRYPTO 2015, held in Santa Barbara, CA, united states, in August 2015. The seventy four revised complete papers offered have been conscientiously reviewed and chosen from 266 submissions. The papers are geared up within the following topical sections: lattice-based cryptography; cryptanalytic insights; modes and structures; multilinear maps and IO; pseudorandomness; block cipher cryptanalysis; integrity; assumptions; hash capabilities and move cipher cryptanalysis; implementations; multiparty computation; zero-knowledge; conception; signatures; non-signaling and information-theoretic crypto; attribute-based encryption; new primitives; and entirely homomorphic/functional encryption.
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Extra info for Advances in Cryptology -- CRYPTO 2015: 35th Annual Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2015, Proceedings, Part II
Springer, Heidelberg (2003) 25. : Secure computation. In: Feigenbaum, J. ) CRYPTO 1991. LNCS, vol. 576, pp. 392–404. Springer, Heidelberg (1992) 26. : An Equational Approach to Secure Multi-Party Computation. In: ITCS 2013, pp. 355–372 (2013) 27. : Composition and integrity preservation of secure reactive systems. In: In 7th ACM Conference on Computer and Communication Security, pp. 245–254 (2000) 28. : On the Security of Mix-Nets and Hierarchical Group Signatures. D. edu Abstract. Recently, Goyal (STOC’13) proposed a new non-black box simulation techniques for fully concurrent zero knowledge with straightline simulation.
The main contribution of our work is a secure computation protocol in the fully concurrent setting with a straight-line simulator, that allows us to achieve several new results: – We give ﬁrst positive results for concurrent blind signatures and veriﬁable random functions in the plain model as per the ideal/real world security definition. Our positive result is somewhat surprising in light of the impossibility result of Lindell (STOC’03) for black-box simulation. We circumvent this impossibility using non-black box simulation.
Concurrent Secure Computation via Non-Black Box Simulation 33 We can model blind signature as a two party computation between the signer and the user for the circuit for generating signatures. Note that the circuit will have the veriﬁcation key vk hardcoded. At the end of the protocol, the user outputs a valid signature σ if obtained, and signer always outputs ⊥. Now we show that this functionality satisﬁes BPC for B = 0 and T algorithm which is same as the signature veriﬁcation algorithm. Note that if the adversary is playing the role of the user, its output is unique and is completely determined by its input message since vk is ﬁxed by the function being computed.