标题：Improved impossible differential attack on reduced-round Lblock
作者：Wang, Ning ;Wang, Xiaoyun ;Jia, Keting
作者机构：[Wang, Ning ;Wang, Xiaoyun ] Key Laboratory of Cryptologic Technology and Information Security, Ministry of Education, Shandong University, Jinan; 250 更多
会议名称：18th International Conference on Information Security and Cryptology, ICISC 2015
会议日期：25 November 2015 through 27 November 2015
来源：Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
关键词：Impossible differential cryptanalysis; LBlock; Lightweight block cipher
摘要：LBlock is a 32-round lightweight block cipher with a 64-bit block size and an 80-bit key. This paper presents a new impossible differential attack on LBlock by improving the previous best result for 1 more round. Based on the nibble conditions, detailed differential properties of LBlock S-Boxes and thorough exploration of subkey relations, we set up well precomputation tables to collect the data needed and propose an optimal key-guessing arrangement to effectively reduce the time complexity of the attack. With these techniques, we launch an impossible differential attack on 24-round LBlock. To the best of our knowledge, this attack is currently the best in terms of the number of rounds attacked (except for biclique attacks). © Springer International Publishing Switzerland 2016.