New PDF release: Advances in Cryptology - ASIACRYPT 2003: 9th International

By Duong Hieu Phan, David Pointcheval (auth.), Chi-Sung Laih (eds.)

ISBN-10: 3540205926

ISBN-13: 9783540205920

This booklet constitutes the refereed court cases of the ninth foreign convention at the thought and alertness of Cryptology and data defense, ASIACRYPT 2003, held in Taipei, Taiwan in November/December 2003.

The 32 revised complete papers awarded including one invited paper have been conscientiously reviewed and chosen from 188 submissions. The papers are equipped in topical sections on public key cryptography, quantity concept, effective implementations, key administration and protocols, hash services, crew signatures, block cyphers, broadcast and multicast, foundations and complexity concept, and electronic signatures.

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Extra resources for Advances in Cryptology - ASIACRYPT 2003: 9th International Conference on the Theory and Application of Cryptology and Information Security, Taipei, Taiwan, November 30 – December 4, 2003. Proceedings

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Micali, and C. Rackoff. The Knowledge Complexity of Interactive Proof Systems. In Proc. of the 17th STOC, pages 291–304. ACM Press, New York, 1985. 13. S. Goldwasser, S. Micali, and R. Rivest. A “Paradoxical” Solution to the Signature Problem. In Proc. of the 25th FOCS, pages 441–448. IEEE, New York, 1984. 14. S. Goldwasser, S. Micali, and R. Rivest. A Digital Signature Scheme Secure Against Adaptive Chosen-Message Attacks. SIAM Journal of Computing, 17(2):281–308, April 1988. 15. A. Joux and K.

Remark 6. Note that even though the two described decryption procedures produce the same result when applied to correctly generated ciphertext they are not equivalent from a computational point of view. Indeed knowing the discrete logarithm a of h with respect to the base g in ZN 2 allows to decrypt any valid ciphertext generated using g and h as underlying public key. More precisely knowledge of a allows to decrypt any ciphertext generated with respect of a public key in {N } × G × H where G × H is the set of the couples (g, h) such that h = g a mod N 2 .

Remark 12. As already pointed out in [5] we notice that any commitment C can be modified in order to obtain some on-line/off-line efficiency property. As a matter of fact such a “modified” commitment scheme C would work as follows: during the off-line stage the sender commits to a random value s with randomness r using C as underlying commitment function. Let a = C(s, r) be the commitment value. Once m is known the sender commits to it by simply sending a and c = m ⊕ s. The only problem with this approach is that it increases the length of the commitment.

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Advances in Cryptology - ASIACRYPT 2003: 9th International Conference on the Theory and Application of Cryptology and Information Security, Taipei, Taiwan, November 30 – December 4, 2003. Proceedings by Duong Hieu Phan, David Pointcheval (auth.), Chi-Sung Laih (eds.)


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