Abstract
Demirci-Selçuk meet-in-the-middle (\(\mathcal {DS}\)-\(\mathsf {MITM}\)) attack is an effective and generic method for analyzing iterative block ciphers. It reaches the best results on attacking AES in the single-key model. In ASIACRYPT 2018, a tool for finding \(\mathcal {DS}\)-\(\mathsf {MITM}\) attack automatically based on general constraint programming was put forward, which can not only enumerate \(\mathcal {DS}\)-\(\mathsf {MITM}\) distinguishers, but also partly automate the key-recovery process. However, the constraint programming models generated by this tool do not consider the key-bridging technique, which has been shown to be effective in reducing the complexities of many cryptanalytic attacks. In this work, we build a general constraint model for SKINNY-128–384 (the same target as the ASIACRYPT 2018 paper) integrated with the key-bridging technique. As a result, the time complexity of the key-recovery attack on SKINNY-128–384 is significantly reduced from \(2^{382.46}\) to \(2^{366.28}\).
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Acknowledgments
The work is supported by the National Natural Science Foundation of China (61802400, 61772519, 61732021, 61802399), the National Key R&D Program of China (Grant No.2018YFA0704704), the Chinese Major Program of National Cryptography Development Foundation (Grant No. MMJJ20180102), and the Youth Innovation Promotion As-sociation of Chinese Academy of Sciences.
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Chen, Q., Shi, D., Sun, S., Hu, L. (2020). Automatic Demirci-Selçuk Meet-in-the-Middle Attack on SKINNY with Key-Bridging. In: Zhou, J., Luo, X., Shen, Q., Xu, Z. (eds) Information and Communications Security. ICICS 2019. Lecture Notes in Computer Science(), vol 11999. Springer, Cham. https://doi.org/10.1007/978-3-030-41579-2_14
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