By Kenji Koyama, Yukio Tsuruoka, Noboru Kunihiro (auth.), Kwok-Yan Lam, Eiji Okamoto, Chaoping Xing (eds.)
Asiacrypt’99 was once held in Singapore on 14-18 November 1999. Asiacrypt is without doubt one of the significant occasions within the cryptology learn group. Asiacrypt’99, the ?fth annual Asiacrypt convention, was once backed by means of the Asiacrypt guidance Comm- tee and the Centre for structures safety of the nationwide college of Singapore, and in cooperation with the foreign organization for Cryptology learn. because the software Co-Chairs of Asiacrypt’99, we're super commemorated to or- nize this occasion, which showcases the state of the art improvement of cryptology study on the end of this millennium. This 12 months, a complete of ninety six study papers have been submitted to Asiacrypt’99. The portfolio of kingdom of foundation of submissions serves as a very good indicator of the - ternational popularity of the convention. international locations 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 approach by means of this system C- mittee, 31 papers of remarkable caliber have been authorised and are incorporated within the convention lawsuits. permitted papers have been authored by way of 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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Extra resources for Advances in Cryptology - ASIACRYPT’99: International Conference on the Theory and Application of Cryptology and Information Security, Singapore, November 14-18, 1999. Proceedings
This impossible diﬀerential is applied to attack on CRYPTON reduced to 5 rounds. 0 can be obtained. 6 chosen plaintext and ciphertext pairs. K. Y. Lam, E. Okamoto and C. ): ASIACRYPT’99, LNCS 1716, pp. 43–51, 1999. c Springer-Verlag Berlin Heidelberg 1999 44 Haruki Seki and Toshinobu Kaneko This paper is organized as follows. Section 2 gives a preliminary. Section 3 brieﬂy reviews algorithms of CRYPTON. In section 4 we describe a 4-round impossible diﬀerential of CRYPTON. 0 reduced to 5 rounds.
Acknowledgment The authors would like to thank R. Schroeppel for motivating their research by announcing an attractive prize for the best cryptanalysis of HPC. References 1. S. , Jan. 1977. 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.
This leads to the following iterated deﬁnition: si,j (K) = Fi−1,j,K (si−1,j (K)) for i = 1, 2, . . , 255 and j = 0, 1, 2, s0,j (K) = F255,j−1,K (s255,j−1(K)) for j = 1, 2. If we consider the stirring function for the HPC variant with 128-bit user key, we note that only Fi,j,K , where 0 ≤ i ≤ 1 and 0 ≤ j ≤ 2, depend on the user Equivalent Keys of HPC 33 key. Thus if si0 ,j0 (K1 ) = si0 ,j0 (K2 ) for two diﬀerent user keys K1 and K2 and i0 ≥ 1, we know that si,j0 (K1 ) = si,j0 (K2 ) for i0 ≤ i ≤ 255, and we also know that s0,j0 +1 (K1 ) = s0,j0 +1 (K2 ) if j0 = 0, 1 or that sfinal (K1 ) = sfinal (K2 ) if j0 = 2.