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Quantum key-recovery attack on Feistel structures

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Abstract

Post-quantum cryptography has drawn considerable attention from cryptologists on a global scale. At Asiacrypt 2017, Leander and May combined Grover’s and Simon’s quantum algorithms to break the FX-based block ciphers, which were introduced by Kilian and Rogaway to strengthen DES. In this study, we investigate the Feistel constructions using Grover’s and Simon’s algorithms to generate new quantum key-recovery attacks on different rounds of Feistel constructions. Our attacks require 20.25nr−0.75n quantum queries to break an r-round Feistel construction. The time complexity of our attacks is less than that observed for quantum brute-force search by a factor of 20.75n. When compared with the best classical attacks, i.e., Dinur et al.’s attacks at CRYPTO 2015, the time complexity is reduced by a factor of 20.5n without incurring any memory cost.

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Acknowledgements

This work was supported by National Key Research and Development Program of China (Grant No. 2017YFA0303903), National Natural Science Foundation of China (Grant No. 61672019), Fundamental Research Funds of Shandong University (Grant No. 2016JC029), National Cryptography Development Fund (Grant No. MMJJ20170121), Zhejiang Province Key R&D Project (Grant No. 2017C01062), and Project Funded by China Postdoctoral Science Foundation (Grant No. 2017M620807).

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Authors and Affiliations

  1. Institute for Advanced Study, Tsinghua University, Beijing, 100084, China

    Xiaoyang Dong & Xiaoyun Wang

  2. Key Laboratory of Cryptologic Technology and Information Security, Ministry of Education, Shandong University, Beijing, 100084, China

    Xiaoyun Wang

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  1. Xiaoyang Dong
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  2. Xiaoyun Wang
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Correspondence to Xiaoyun Wang.

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Dong, X., Wang, X. Quantum key-recovery attack on Feistel structures. Sci. China Inf. Sci. 61, 102501 (2018). https://doi.org/10.1007/s11432-017-9468-y

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  • DOI: https://doi.org/10.1007/s11432-017-9468-y

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