Kenji Koyama, Yukio Tsuruoka, Noboru Kunihiro (auth.),'s Advances in Cryptology - ASIACRYPT’99: International PDF

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 group. Asiacrypt’99, the ?fth annual Asiacrypt convention, was once backed by means of the Asiacrypt steerage Comm- tee and the Centre for structures protection of the nationwide college of Singapore, and in cooperation with the overseas organization for Cryptology examine. because the software Co-Chairs of Asiacrypt’99, we're tremendous commemorated to or- nize this occasion, which showcases the cutting-edge improvement of cryptology study on the end of this millennium. This yr, a complete of ninety six learn papers have been submitted to Asiacrypt’99. The portfolio of nation of starting place of submissions serves as a great 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 by way of this system C- mittee, 31 papers of exceptional caliber have been permitted and are incorporated within the convention complaints. permitted papers have been authored through researchers from the subsequent nations: 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

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38 2. B. Preneel, R. Govaerts, J. Vandewalle, “Hash functions based on block ciphers: a synthetic approach,” Advances in Cryptology, Proceedings Crypto’93, LNCS 773, D. , Springer-Verlag, 1994, pp. 368–378. 38, 39 3. R. edu/~ rcs/hpc, 1998. 29 4. R. Schroeppel, “The Hasty Pudding Cipher: Specific NIST requirements,” AESsubmission, 1998. 29 5. R. edu/ rcs/hpc/tweak, 1999. 39 6. D. edu/~ daw 30 A Construction of 128-bit Weak Keys In this appendix we show how to construct the weak 128-bit user keys.

7 we show that HPC-based hash functions are insecure, and in Sect. 8 we discuss how the weak keys can be avoided. Finally we conclude in Sect. 9. In this paper all numbers in hexadecimal notation (indicated with a subscript x) are written with the least significant byte on the right side. Numbers in decimal notation have no subscript or a subscript d. The least significant bit (that is, the rightmost bit) is numbered bit 0. 2 HPC Expanded Key Generation The expanded key table (denoted by KX-table) contains 286 64-bit words.

In section 4 we describe a 4-round impossible differential of CRYPTON. 0 reduced to 5 rounds. 5 reduced to 5 rounds. We conclude in section 7. 2 Preliminary In this paper we use next definitions. Definition 1. Aiγ , Aiπ , Aiτ , Aiσ : Input of γ, π, τ, σ transformation in round i Definition 2. Bγi , Bπi , Bτi , Bσi : Output of γ, π, τ, σ transformation in round i Definition 3. A : Differential value of a pair of A Definition 4. P, C: Plaintext, ciphertext Definition 5. Kei : A 128-bit roundkey in round i Definition 6.

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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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