Advances in Cryptology – CRYPTO 2008: 28th Annual by Jean-Sébastien Coron, Jacques Patarin, Yannick Seurin

By Jean-Sébastien Coron, Jacques Patarin, Yannick Seurin (auth.), David Wagner (eds.)

This ebook constitutes the refereed court cases of the twenty eighth Annual overseas Cryptology convention, CRYPTO 2008, held in Santa Barbara, CA, united states in August 2008.

The 32 revised complete papers offered have been conscientiously reviewed and chosen from 184 submissions. Addressing all present foundational, theoretical and study features of cryptology, cryptography, and cryptanalysis in addition to complex functions, the papers are geared up in topical sections on random oracles, purposes, public-key crypto, hash services, cryptanalysis, multiparty computation, privateness, 0 wisdom, and oblivious transfer.

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Additional info for Advances in Cryptology – CRYPTO 2008: 28th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 17-21, 2008. Proceedings

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B . It sets h0 = g a0 −1 hb0 and hi = g ai hbi for 1 ≤ i ≤ and returns κ = (h0 , . . , h ) and t = (a0 , b0 , . . , a , b ). TrapEval(t, X) parses X = (x1 , . . , x ) ∈ {0, 1} and returns a = a0 − 1 + i=1 ai xi and b = b0 + i=1 bi xi . It is clear that this fulfills the syntactic and correctness requirements of Definition 1. Also, since the bi are chosen independently and uniformly, so are the hi , and the trapdoor keys indistinguishability requirement follows. It is more annoying to prove (3), and we will only give an intuition here.

839, pp. 216–233. Springer, Heidelberg (1994) 3. : Random oracles are practical: A paradigm for designing efficient protocols. In: Ashby, V. ) ACM CCS 1993, Fairfax, Virginia, USA, November 3–5, 1993, pp. 62–73. ACM Press, New York (1993) 4. : The exact security of digital signatures: How to sign with RSA and Rabin. M. ) EUROCRYPT 1996. LNCS, vol. 1070, pp. 399–416. Springer, Heidelberg (1996) 5. : Efficient selective-ID secure identity based encryption without random oracles. L. ) EUROCRYPT 2004. LNCS, vol.

We propose generic digital signature schemes from the strong RSA problem and from some hardness assumption on bilinear maps that can be instantiated with any PHF. Our schemes offer various improvements over known constructions. In particular, for a reasonable choice of parameters, we obtain short standard model digital signatures over bilinear maps. 1 Programmable Hash Functions A group hash function is an efficiently computable function that maps binary strings into a group G. We propose the concept of a programmable hash function which is a keyed group hash function that can behave in two indistinguishable ways, depending on how the key is generated.

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