Cryptography

Download Progress in Cryptology - AFRICACRYPT 2010: Third by Daniel J. Bernstein, Tanja Lange PDF

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By Daniel J. Bernstein, Tanja Lange

This publication constitutes the complaints of the 3rd overseas convention on Cryptology in Africa, AFRICACRYPT 2010, held in Stellenbosch, South Africa, on could 3-6, 2010. The 25 papers provided including 3 invited talks have been conscientiously reviewed and chosen from eighty two submissions. the subjects lined are signatures, assaults, protocols, networks, elliptic curves, side-channel assaults and fault assaults, public-key encryption, keys and PUFs, and ciphers and hash features.

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Extra resources for Progress in Cryptology - AFRICACRYPT 2010: Third International Conference on Cryptology in Africa, Stellenbosch, South Africa, May 3-6, 2010, Proceedings ... Computer Science Security and Cryptology)

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Simulation-sound NIZK proofs for a practical language and constant size group signatures. , Chen, K. ) ASIACRYPT 2006. LNCS, vol. 4284, pp. 444–459. : Fully anonymous group signatures without random oracles. In: Kurosawa, K. ) ASIACRYPT 2007. LNCS, vol. 4833, pp. 164–180. : Homomorphic trapdoor commitments to group elements. : Efficient non-interactive proof systems for bilinear groups. P. ) EUROCRYPT 2008. LNCS, vol. 4965, pp. 415–432. : On the anonymity of fair offline e-cash systems. N. ) FC 2003.

Unforgeability. e. after q − 1 Sign-oracle queries, he outputs q signatures on different messages. We show that the adversary must have broken signature traceability: indeed since there are more signatures than Fair Blind Signatures without Random Oracles 23 transcripts, either there is a signature which no transcripts points to, or there is a transcript that points to two signatures. e. ∀ U, V ∈ G ∀ a, b ∈ Z : e(U a , V b ) = e(U, V )ab , and e(G, G) is a generator of GT . The Decision Linear (DLIN) Assumption [BBS04], in (p, G, GT , e, G) states that given (Gα , Gβ , Grα , Gsβ , Gt ) for random α, β, r, s ∈ Zp , it is hard to decide whether t = r + s or t is random.

Sign(sk, U ) and sends B. – U checks whether the signature is valid and aborts if it is invalid. Otherwise, the user computes C ← Enc(rpkE , U ||B) together with a NIZK proof π that a valid signature is encrypted properly. Then it outputs the signature (C, π). Verification. t. t. ρ). We briefly discuss the security of the scheme and then how to derive a fair partially blind signature scheme out of Fischlin’s blind signature scheme. Unforgeability of the scheme follows from the unforgeability of the regular signature scheme and from the binding property of the commitment.

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