How to Strengthen DES-like Cryptosystems against Differential Cryptanalysis

Kenji KOYAMA; Routo TERADA

How to Strengthen DES-like Cryptosystems against Differential Cryptanalysis

Kenji KOYAMA, Routo TERADA

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We propose a new randomized version of DES in which a key-dependent swapping is used to strengthen DES and DES-like cryptosystems against differential cryptanalysis. This new scheme, called RDES, decreases the probability of success in differential attack by decreasing the characteristic probability. The characteristic is the effect of particular differences in plaintext pairs on the differences in the resultant ciphertext pairs. The characteristic probability for the n-round RDES is 2^-n+1 times that for the n-round DES. As for the differential cryptanalysis based on characteristics, the 16-round RDES is as strong as the about 20-round DES. Encryption/decryption speed of n-round RDES is almost the same as that of the n-round DES.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E76-A No.1 pp.63-69

Publication Date: 1993/01/25

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Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)

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Kenji KOYAMA, Routo TERADA, "How to Strengthen DES-like Cryptosystems against Differential Cryptanalysis" in IEICE TRANSACTIONS on Fundamentals, vol. E76-A, no. 1, pp. 63-69, January 1993, doi: .
Abstract: We propose a new randomized version of DES in which a key-dependent swapping is used to strengthen DES and DES-like cryptosystems against differential cryptanalysis. This new scheme, called RDES, decreases the probability of success in differential attack by decreasing the characteristic probability. The characteristic is the effect of particular differences in plaintext pairs on the differences in the resultant ciphertext pairs. The characteristic probability for the n-round RDES is 2^-n+1 times that for the n-round DES. As for the differential cryptanalysis based on characteristics, the 16-round RDES is as strong as the about 20-round DES. Encryption/decryption speed of n-round RDES is almost the same as that of the n-round DES.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e76-a_1_63/_p

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@ARTICLE{e76-a_1_63,
author={Kenji KOYAMA, Routo TERADA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={How to Strengthen DES-like Cryptosystems against Differential Cryptanalysis},
year={1993},
volume={E76-A},
number={1},
pages={63-69},
abstract={We propose a new randomized version of DES in which a key-dependent swapping is used to strengthen DES and DES-like cryptosystems against differential cryptanalysis. This new scheme, called RDES, decreases the probability of success in differential attack by decreasing the characteristic probability. The characteristic is the effect of particular differences in plaintext pairs on the differences in the resultant ciphertext pairs. The characteristic probability for the n-round RDES is 2^-n+1 times that for the n-round DES. As for the differential cryptanalysis based on characteristics, the 16-round RDES is as strong as the about 20-round DES. Encryption/decryption speed of n-round RDES is almost the same as that of the n-round DES.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - How to Strengthen DES-like Cryptosystems against Differential Cryptanalysis
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 63
EP - 69
AU - Kenji KOYAMA
AU - Routo TERADA
PY - 1993
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E76-A
IS - 1
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - January 1993
AB - We propose a new randomized version of DES in which a key-dependent swapping is used to strengthen DES and DES-like cryptosystems against differential cryptanalysis. This new scheme, called RDES, decreases the probability of success in differential attack by decreasing the characteristic probability. The characteristic is the effect of particular differences in plaintext pairs on the differences in the resultant ciphertext pairs. The characteristic probability for the n-round RDES is 2^-n+1 times that for the n-round DES. As for the differential cryptanalysis based on characteristics, the 16-round RDES is as strong as the about 20-round DES. Encryption/decryption speed of n-round RDES is almost the same as that of the n-round DES.
ER -