LBlock is a 32-round lightweight block cipher with 64-bit block size and 80-bit key. This paper identifies 16- round related-key impossible differentials of LBlock, which are better than the 15-round related-key impos...LBlock is a 32-round lightweight block cipher with 64-bit block size and 80-bit key. This paper identifies 16- round related-key impossible differentials of LBlock, which are better than the 15-round related-key impossible differentials used in the previous attack. Based on these 16-round related-key impossible differentials, we can attack 23 rounds of LBlock while the previous related-key impossible differential attacks could only work on 22-round LBlock. This makes our attack on LBlock the best attack in terms of the number of attacked rounds.展开更多
基金supported by the National Basic Research 973 Program of China under Grant No.2013CB834205the National Natural Science Foundation of China under Grant Nos.61133013,61070244,and 61103237+1 种基金the Program for New Century Excellent Talents in University of China under Grant No.NCET-13-0350the Interdisciplinary Research Foundation of Shandong University of China under Grant No.2012JC018
文摘LBlock is a 32-round lightweight block cipher with 64-bit block size and 80-bit key. This paper identifies 16- round related-key impossible differentials of LBlock, which are better than the 15-round related-key impossible differentials used in the previous attack. Based on these 16-round related-key impossible differentials, we can attack 23 rounds of LBlock while the previous related-key impossible differential attacks could only work on 22-round LBlock. This makes our attack on LBlock the best attack in terms of the number of attacked rounds.
