By Martin Hirt, Ueli Maurer, Vassilis Zikas (auth.), Josef Pieprzyk (eds.)
This ebook constitutes the refereed complaints of the 14th foreign convention at the thought and alertness of Cryptology and data defense, ASIACRYPT 2008, held in Melbourne, Australia, in December 2008.
The 33 revised complete papers offered including the summary of one invited lecture have been rigorously reviewed and chosen from 208 submissions. The papers are geared up in topical sections on muliti-party computation, cryptographic protocols, cryptographic hash services, public-key cryptograhy, lattice-based cryptography, private-key cryptograhy, and research of movement ciphers.
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Additional info for Advances in Cryptology - ASIACRYPT 2008: 14th International Conference on the Theory and Application of Cryptology and Information Security, Melbourne, Australia, December 7-11, 2008. Proceedings
Hence, the shared value is uniquely determined by the views of the players. Therefore, we can use protocol CompSFE to evaluate any (reactive) circuit as follows: For each input gate, invoke CompSFE to evaluate the circuit Cinput which computes a sharing (according to SZ ) of the input value. For the addition and multiplication gate, invoke CompSFE to evaluate the circuits Cadd and Cmult which on input the sharings of two values s and t output a sharing of the sum s + t and of the product st, respectively.
An admissible PDAG has 2 input nodes. e. (1, 1), . . , (1, )) represent the x-input nodes while the remaining ones represent the y-input nodes. Let C : [m] × [m] → [n] be a n-coloring function that associates to each node (i, j) of G a color C(i, j) chosen from a set of n possible colors. The following notion will be used . to express the property we expect the graph coloring to have in order to build Definition 3 (). We say that C : [m] × [m] → [n] is a t-reliable n-coloring for the admissible PDAG G (with share parameter and size parameter m) if for each t-color subset I ⊂ [n], there exist j ∗ ∈ [ ] and jy∗ ∈ [ ] such that: – There exists a path PATHx in G from the j ∗ th x-input node to the j ∗ th output node, such that none of the path node colors are in subset I (it is called an I-avoiding path), and – There exists an I-avoiding path PATHy in G from the jy∗ th y-input node to the j ∗ th output node.
Since A1 ∪ A2 ∪ A3 = P , we have M (1, ρ1 )τ M (1, ρ2 )τ M (1, ρ3 )τ = 0τ , which contradicts Deﬁnition 2. On the other hand, a general construction for building a 3-multiplicative LSSS from a strongly multiplicative LSSS is given in the next section, thus suﬃciency is guaranteed by Proposition 2. A trivial example of 3-multiplicative LSSS is Shamir’s threshold secret sharing scheme that realizes any Q3 threshold access structure. Using an identical argument for the case of strongly multiplicative LSSS, we have a general construction for 3-multiplicative LSSS based on Shamir’s threshold secret sharing schemes, with exponential complexity.
Advances in Cryptology - ASIACRYPT 2008: 14th International Conference on the Theory and Application of Cryptology and Information Security, Melbourne, Australia, December 7-11, 2008. Proceedings by Martin Hirt, Ueli Maurer, Vassilis Zikas (auth.), Josef Pieprzyk (eds.)