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《Acta Electronica Sinica》 2017-04
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Impossible Differential Cryptanalysis of Reduced-Round LBlock-s

JIA Ping;XU Hong;LAI Xue-jia;Information Engineering University;State Key Laboratory of Mathematical Engineering and Advanced Computing;Department of Computer Science & Engineering,Shanghai Jiao Tong University;  
LBlock-s is the kernel block cipher of the authentication encryption algorithm LAC submitted to CAESAR competition. The general structure of LBlock-s is almost the same as that of LBlock,but LBlock-s adopts an improved key schedule algorithm with better diffusion property. Using the shifting relation of subkeys derived by the key schedule algorithm,an impossible differential cryptanalysis on 21-round LBlock-s was presented based on a 14-round impossible differential.The time and data complexities are 2~(67.61) 21-round encryptions and 2~(63) chosen plaintexts respectively, and the number of subkey bits needed to be guessed is 72. Using partial-matching method, an impossible differential cryptanalysis on LBlock-s up to 23-round was also presented with time complexity less than exhaustion of all key bits. This work is useful for the security analysis of LAC algorithm.
【Fund】: 国家自然科学基金(No.61100200 No.61170235 No.61309017 No.61472251 No.61502524 No.61521003 No.U1536101);; 国家863高技术研究发展计划(No.2015AA01A708)
【CateGory Index】: TP309.7;;TN918.1
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【Secondary Citations】
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1 LUO Wei,GUO Jian-sheng(The PLA Information Engineering University,Zhengzhou,Henan 450004,China);Related-Key Differential Attacks on Cobra-H64/128[J];电子学报;2013-08
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3 ZHANG Wen-ying1,3,4,LIU Xiang-zhong2(1.School of Information Science and Engineering,Shandong Normal University,Jinan,Shandong 250014,China;2.No.2 Middle School Attached to Shandong Normal University,Jinan,Shandong 250014,China;3.Shandong Provincial Key Laboratory for Novel Distributed Computer Software Technology Jinan,Shandong 250014,China;4.State Key Lab of Information Security,Institute of Information Engineering,Chinese Academy of Sciences,Beijing 100093,China);An Related-Key Meet-in-the-Middle Algebraic Attack on the NLFSR Based Block Cipher KTANTAN32[J];电子学报;2012-10
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