New PDF release: Advances in Cryptology - ASIACRYPT’99: International

By Kenji Koyama, Yukio Tsuruoka, Noboru Kunihiro (auth.), Kwok-Yan Lam, Eiji Okamoto, Chaoping Xing (eds.)

ISBN-10: 3540666664

ISBN-13: 9783540666660

Asiacrypt’99 was once held in Singapore on 14-18 November 1999. Asiacrypt is likely one of the significant occasions within the cryptology examine neighborhood. Asiacrypt’99, the ?fth annual Asiacrypt convention, was once backed by way of the Asiacrypt guidance Comm- tee and the Centre for structures defense of the nationwide collage of Singapore, and in cooperation with the overseas organization for Cryptology examine. because the application Co-Chairs of Asiacrypt’99, we're super venerated to or- nize this occasion, which showcases the state of the art improvement of cryptology examine on the end of this millennium. This 12 months, a complete of ninety six examine papers have been submitted to Asiacrypt’99. The portfolio of state of foundation of submissions serves as an exceptional indicator of the - ternational popularity of the convention. nations from which submissions or- inated contain: Australia, Belgium, China, Estonia, France, Germany, Greece, India, Iran, Japan, Korea, Norway, Russia, Saudi Arabia, Switzerland, Sin- pore, Spain, Taiwan, Thailand, The Netherlands, Turkey, Ukraine, united kingdom, united states and Yugoslavia. via a stringent refereeing technique via this system C- mittee, 31 papers of remarkable caliber have been authorized and are incorporated within the convention court cases. authorized papers have been authored via researchers from the subsequent international locations: Australia, Belgium, France, Germany, India, Japan, China, Singapore, Switzerland, Taiwan, The Netherlands, united kingdom, and USA.

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Additional info for Advances in Cryptology - ASIACRYPT’99: International Conference on the Theory and Application of Cryptology and Information Security, Singapore, November 14-18, 1999. Proceedings

Sample text

A first observation is that equivalent keys for the block cipher E lead to trivial collisions for the hash function. Indeed, if the Xi ’s are chosen from a single equivalence class (that contains 230 keys), the value of Hi will not change. A second observation is that equivalent keys lead to trivial 2nd preimage attacks in a similar way. The fact that in 1 case out of 256 key search can be sped up with a factor of 238 implies that finding a 2nd preimage can take advantage of the same speed-up. By applying an affine transformation of variables (for example, swapping Xi and Hi−1 ), the above attacks may become attacks on the compression function rather than on the hash function.

168, American Mathematical Society, 1994, pp. 291-308. 52 11. S. Robinson, A Course in the Theory of Groups, Springer, New York, 1982. 53 12. J-P. Tillich and G. G. Desmedt (Ed), Advances in Cryptology — CRYPTO ’94, Lecture Notes in Computer Science 839, Springer, Berlin, 1994, pp. 40-49. 52 13. A. Yamamura, ‘Public-key cryptosystems using the modular group’, in Imai, Hideki (Eds) et al. International Workshop on the Theory and Practice of Cryptography, Lecture Notes in Computer Science 1431, Springer, Berlin, 1998, pp.

C. C. for their support K. Y. Lam, E. Okamoto and C. ): ASIACRYPT’99, LNCS 1716, pp. 52–61, 1999. c Springer-Verlag Berlin Heidelberg 1999 Cryptanalysis of Two Cryptosystems Based on Group Actions 53 proposed in [13] to the security of the cryptosystem proposed in [14]; hence both cryptosystems are insecure. The rest of this paper is organised as follows. Section 2 contains the background on SL2 (Z) that we require. Section 3 describes the two cryptosystems that Yamamura proposes. Section 4 cryptanalyses these systems, and Section 5 discusses a slightly more general class of cryptosystems.

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Advances in Cryptology - ASIACRYPT’99: International Conference on the Theory and Application of Cryptology and Information Security, Singapore, November 14-18, 1999. Proceedings by Kenji Koyama, Yukio Tsuruoka, Noboru Kunihiro (auth.), Kwok-Yan Lam, Eiji Okamoto, Chaoping Xing (eds.)


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