Cryptography – Communication system using cryptography – Time segment interchange
Patent
1993-06-04
1994-09-27
Swann, Tod R.
Cryptography
Communication system using cryptography
Time segment interchange
380 29, 380 42, H04K 104
Patent
active
053512995
ABSTRACT:
Disclosed is a data encryption apparatus strong to differential cryptanalysis, which is now the most influential cryptanalysis method.
According to the data encryption apparatus, input data is divided into N blocks, 1 to N-1 blocks of which is selected by a first selection unit with a block selection key. Then the selected blocks of data is compressed into a single block of data in a first combination unit, and encrypted with a data encryption key in an F-function unit. A second combination unit combines the blocks of data not selected in the first selection unit with the output of the F-function unit by XOR. An output unit outputs N blocks of data arranged in the same order as the initial N blocks, in which the 1 to N-1 blocks selected in the first selection unit are outputted without any change, and the other blocks being the outputs of the second combination unit.
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1981 International Conference on Communications, Denver Colo. USA Jun. 14-18 1981, IEEE pp. 40.1.1-40.1.5, Subodn Banerjee, "Milions DITS of DES Encryption in the Blink of an Eye".
"Fast Data Encipherment Algorithm Feal", by A. Shimizu et al., Eurocrypt '87, Springer Verlag.
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How to Strengthen DES-Like Cryptosystems Against Differential Cryptanalysis, by K. Koyama et al., IEICE Trans. Fundamentals, vol. E76-A, No. 1, Jan. 1993.
Matsuzaki Natsume
Tatebayashi Makoto
Matsushita Electric - Industrial Co., Ltd.
Swann Tod R.
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