By Charanjit S. Jutla, Arnab Roy (auth.), Kazue Sako, Palash Sarkar (eds.)
The two-volume set LNCS 8269 and 8270 constitutes the refereed lawsuits of the nineteenth overseas convention at the conception and alertness of Cryptology and data, Asiacrypt 2013, held in Bengaluru, India, in December 2013. The fifty four revised complete papers provided have been conscientiously chosen from 269 submissions. they're prepared in topical sections named: zero-knowledge, algebraic cryptography, theoretical cryptography, protocols, symmetric key cryptanalysis, symmetric key cryptology: schemes and research, side-channel cryptanalysis, message authentication codes, signatures, cryptography established upon actual assumptions, multi-party computation, cryptographic primitives, research, cryptanalysis and passwords, leakage-resilient cryptography, two-party computation, hash functions.
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Additional resources for Advances in Cryptology - ASIACRYPT 2013: 19th International Conference on the Theory and Application of Cryptology and Information Security, Bengaluru, India, December 1-5, 2013, Proceedings, Part I
The authority retains the following master secret key MSK: g2 , f (= gc2 ), and Δ1 , Δ2 , Δ3 , Δ4 , Δ5 , d, e, u, z. Encrypt(PK, i , M ). The encryption algorithm chooses s and tag at random from Zq . It then blinds M as C0 = M · ks , and also creates i ·s tag·s · vh·s , s C1 = gs1 , C2 = gb·s 1 , C3 = v1 · v2 · v3 4 where h = H(C0 , C1 , C2 , tag, i ). The ciphertext is then C = C0 , C1 , C2 , C3 , tag, p1 , p2 , where p1 , p2 is a QA-NIZK proof that C0 , C1 , C2 , C3 , i, tag, h ∈ L. KeyGen(MSK, i ).
Let us partition the Zq matrix 1×t A as At×t and the candidate vector l as l 0 At×s 0 1 1×s l1 . Note that, since A0 has rank t, the elements of l 0 are ‘free’ elements and l 0 can be extended to a unique n element vector l , which is a member of LA . This member vector l can be computed as l := l 0 −1 −l 0 · W , nothing W = −A0 A1 . The proof of l is computed as p := l 0 · D . Since both (l , p) and (l , p ) pass the veriﬁcation equation, we obtain: l 1 − l 1 = b(p − p), where l 1 = −l 0 · W. In particular there exists i ∈ [1, s], such that, l 1i − l 1i = b(pi − pi ) = 01 .
At this point, one may immediately object that in the case of a single veriﬁer identity, the problem is not interesting since the bounded player model is identical to the bare-public key model, where one can construct four-round cZK protocols using rewinding based techniques. However, simulation techniques involving rewinding do not “scale” well to the case of polynomially many identities (unless we use a large number of rounds) and fail. In contrast, our simulation approach is “straight-line” for an unbounded number of sessions and scales well to a large bounded number of identities.