ASIACRYPT '99 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
On the Pseudorandomness of Top-Level Schemes of Block Ciphers
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Finding the differential characteristics of block ciphers with neural networks
Information Sciences: an International Journal
Cryptographic Properties and Application of a Generalized Unbalanced Feistel Network Structure
ACISP '09 Proceedings of the 14th Australasian Conference on Information Security and Privacy
Impossible Boomerang Attack for Block Cipher Structures
IWSEC '09 Proceedings of the 4th International Workshop on Security: Advances in Information and Computer Security
Cryptanalysis of Skipjack reduced to 31 rounds using impossible differentials
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Attacking reduced-round versions of the SMS4 block cipher in the Chinese WAPI standard
ICICS'07 Proceedings of the 9th international conference on Information and communications security
Pseudorandomness analysis of the (extended) Lai-Massey scheme
Information Processing Letters
Impossible differential cryptanalysis of 13-round CLEFIA-128
Journal of Systems and Software
Security analysis of the GF-NLFSR structure and four-cell block cipher
ICICS'09 Proceedings of the 11th international conference on Information and Communications Security
Information Processing Letters
Improved results on impossible differential cryptanalysis of reduced-round Camellia-192/256
Journal of Systems and Software
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In this paper, we propose a systematic method for finding impossible differentials for block cipher structures, which we call the unified impossible differential finding method or UID-method. It is more effective than the U-method introduced by Kim et al. We apply the UID-method to some well-known block cipher structures. Using it, we find a 16-round impossible differential for Gen-Skipjack and a 19-round impossible differential for Gen-CAST256. By this result we can disprove Sung's long standing conjecture that no such differential is possible for 16 or more rounds. On Gen-MARS and SMS4, the impossible differentials found by the UID-method are much longer than those found by the U-method. On the Four-Cell and Gen-RC6 block ciphers, our results are the same as the best results previously obtained.