کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
392883 | 665194 | 2014 | 10 صفحه PDF | دانلود رایگان |
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 UU-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 UU-method. On the Four-Cell and Gen-RC6 block ciphers, our results are the same as the best results previously obtained.
Journal: Information Sciences - Volume 263, 1 April 2014, Pages 211–220