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

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

Asiacrypt’99 used to be held in Singapore on 14-18 November 1999. Asiacrypt is without doubt one of the significant occasions within the cryptology study neighborhood. Asiacrypt’99, the ?fth annual Asiacrypt convention, was once subsidized by means of the Asiacrypt guidance Comm- tee and the Centre for platforms protection of the nationwide collage of Singapore, and in cooperation with the overseas organization for Cryptology learn. 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 examine on the end of this millennium. This yr, 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 recognition 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 procedure through this system C- mittee, 31 papers of remarkable caliber have been authorized and are incorporated within the convention complaints. accredited papers have been authored by way of researchers from the next nations: Australia, Belgium, France, Germany, India, Japan, China, Singapore, Switzerland, Taiwan, The Netherlands, united kingdom, and USA.

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Extra 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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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. The construction of 192-bit and 256-bit weak keys is omitted due to space restrictions. Equivalent Keys of HPC 41 To construct a 128-bit weak key we have to satisfy (6) for the least significant byte of s02 : 01x = s02 + 36x + 0bx | (54x + s02 13) (12) L = 0bx |R , (13) where L = cbx − s02 and R = (54x + s02 13).

Jp Abstract. An block cipher CRYPTON based on the structure of SQUARE is a candidate algorithm for the AES. 0) in FSE’99. In this paper we present an attack on CRYPTON reduced to 5 rounds. This attack is based on impossible differentials[7]. 4 chosen plaintext and ciphertext pairs. 5 using less chosen plaintext and ciphertext pairs. Lim proposed an block cipher CRYPTON[1] based on the structure of SQUARE[5]. It is a candidate algorithm for the AES. Several analyses were proposed to this cipher. 5[3].

If z ∈ O then halt. Set k = k + 1. If z ∈ P then set sk = A, if z ∈ Q then set sk = A2 and if z ∈ R then set sk = B. 5. Set z = s−1 k (z). 6. Return to step 2. sn is the normal form of ±g; see Yamamura [14] for details. Cryptanalysis of Two Cryptosystems Based on Group Actions 3 55 The Cryptosystems This section describes the two public key cryptosystems proposed by Yamamura. We refer to the system proposed in [13] as the “polynomial-based scheme” and the system proposed in [14] as the “point-based scheme”.

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