Cryptography

Get 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 subsidized by way of the Asiacrypt steerage Comm- tee and the Centre for platforms safety of the nationwide college of Singapore, and in cooperation with the overseas organization for Cryptology learn. because the application Co-Chairs of Asiacrypt’99, we're super commemorated to or- nize this occasion, which showcases the state of the art improvement of cryptology learn 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 foundation of submissions serves as an outstanding indicator of the - ternational recognition 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 technique through this system C- mittee, 31 papers of exceptional caliber have been accredited and are integrated within the convention complaints. permitted papers have been authored via 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 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

Example text

For the 128-bit variant of HPC, we can find 290 equivalence classes, each containing 230 elements. 3 Equivalent Keys (Key Length Equal to 128 Bits) Before the stirring function is applied to the KX-table, the user key is XORed into the KX-table (see Sect. 2). For the AES candidate HPC with user key length equal to 128 bits, only KX[0] and KX[1] are influenced by the user key. The other values KX[2] up to KX[255] are independent of the 128-bit user key. Of course this is only true before the stirring function is applied to the KX-table.

For the AES candidate HPC with user key length equal to 128 bits, only KX[0] and KX[1] are influenced by the user key. The other values KX[2] up to KX[255] are independent of the 128-bit user key. Of course this is only true before the stirring function is applied to the KX-table. A closer investigation of the key expansion leads us to an equation, from now on called the dangerous equation: s0 ^= (KX[i] ^ KX[(i+83)&255]) + KX[s0&255] . (5) This equation is dangerous because when s0 & 255d = i, different values of KX[i] can produce the same result.

46 Haruki Seki and Toshinobu Kaneko Round 0 Plaintext σ Round 1 γ π τ σ π τ σ Round 2 γ Contradiction ! Round 3 γ −1 π −1 τ −1 σ −1 Round 4 γ −1 Fig. 2. The 4-round impossible differential. White squares represents zero differences, gray squares represents nonzero differences. Cryptanalysis of Five Rounds of CRYPTON 47 (a) The differences of 4 words in only one column of the plaintext pair are nonzero, and the differences of all 12 words in other 3 columns are zero. For example,  a000     b 0 0 0  P =  c 0 0 0   d000 (b) The differences of one or two words in any one column of Bγ4 are nonzero, and those of all other 15 or 14 words are zero.

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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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