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WANG Caibing, GUO Hao, YE Dingfeng, WANG Ping. Statistical Model on CRAFT[J]. Chinese Journal of Electronics. doi: 10.1049/cje.2021.00.092
Citation: WANG Caibing, GUO Hao, YE Dingfeng, WANG Ping. Statistical Model on CRAFT[J]. Chinese Journal of Electronics. doi: 10.1049/cje.2021.00.092

Statistical Model on CRAFT

doi: 10.1049/cje.2021.00.092
Funds:  This work was supported by the National Key R&D Program of China (2018YFA0704704), Natural Science Foundation of China (NSFC) (61772519), and the Chinese Major Program of National Cryptography Development Foundation (MMJJ20180102)
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  • Author Bio:

    (corresponding author) is a Ph.D. candidate of Institute of Information Engineering, University of Chinese Academy of Sciences. Her research interest focuses on symmetric cryptanalysis and design. (Email: wangcaibing@iie.ac.cn)

    is a Ph.D. candidate of Institute of Information Engineering, University of Chinese Academy of Sciences. His research interest focuses on symmetric cryptanalysis and design. (Email: guohao@iie.ac.cn)

    received the Ph.D. degree in mathematics from Chinese Academy of Sciences in 1996. He is a Professor in Institute of Information Engineering, University of Chinese Academy of Sciences. His research interests include basic theory of applications of pseudorandom sequences and arrays, analysis of cryptographic algorithms, and theoretical cryptography. (Email: yedingfeng@iie.ac.cn)

    is a Senior Engineer at Tianjin Aerospace Zhongwei Data System Technology Co., Ltd. His research interests include communication and remote sensing. (Email: 2231961836@qq.com)

  • Received Date: 2021-03-14
  • Accepted Date: 2021-05-17
  • Available Online: 2021-08-20
  • Many cryptanalytic techniques for symmetric-key primitives rely on specific statistical analysis to extract some secrete key information from a large number of known or chosen plaintext-ciphertext pairs. For example, there is a standard statistical model for differential cryptanalysis that determines the success probability and complexity of the attack given some predefined configurations of the attack. In this work, we investigate the differential attack proposed by Guo et al. at Fast Software Encryption Conference 2020 and find that in this attack, the statistical behavior of the counters for key candidates deviate from standard scenarios, where both the correct key and the correct key xor specific difference are expected to receive the largest number of votes. Based on this bimodal behavior, we give three different statistical models for truncated differential distinguisher on CRAFT (a cryptographic algorithm name) for bimodal phenomena. Then, we provide the formulas about the success probability and data complexity for different models under the condition of a fixed threshold value. Also, we verify the validity of our models for bimodal phenomena by experiments on round-reduced of the versions distinguishers on CRAFT. We find that the success probability of theory and experiment are close when we fix the data complexity and threshold value. Finally, we compare the three models using the mathematical tool Matlab and conclude that Model 3 has better performance.
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