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Quantum attacks on generalized Feistel networks based on the strong–weak separability

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Abstract

Generalized Feistel networks are important components of symmetric ciphers, and detailed security evaluations in the quantum setting remain to be explored. In this paper, based on the strong–weak separability of certain branch output function, we present polynomial-time quantum distinguishers for 4F-function and 2F-function structures in quantum chosen-plaintext attack setting for the first time, and then quantum key-recovery attacks are achieved through Grover-meet-Simon algorithm, respectively. Under the condition of the semi-strong separability, firstly, we give a quantum distinguisher on 8-round 4F-function structure, from which we carry out a 12-round quantum key-recovery attack to guess 10n-bit subkey, whose time complexities gain a factor of \(2^{5n}\). When attacking \(r>12\) rounds, we can recover \(4(r - 12)n + 10n\)-bit subkey in time \({2^{\frac{{4(r - 12)n + 10n}}{2}}}\). Secondly, we show a quantum distinguisher on 5-round 2F-function structure, and a 7-round quantum key-recovery attack is performed on it, which can recover 3n-bit subkey in time \({2^{1.5n}}\). When \(r>7\), \(2(r - 7)n + 3n\)-bit subkey can be recovered with time complexities by a factor of \({2^{\frac{{2(r - 7)n + 3n}}{2}}}\). Furthermore, based on the weak separability, a 6-round quantum distinguisher for 2F-function structure is constructed, and an 8-round quantum key-recovery attack is achieved, and the time complexity is \({2^{\frac{{2(r - 8)n + 3n}}{2}}}\) when \(r>8\). The results show that the time complexity of each attack scheme we proposed is much better than that of Grover’s brute force search.

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Acknowledgements

This work was partially supported by the National Natural Science Foundation of China (Grant Nos. 62172337 and 61902073) and Key Project of Gansu Natural Science Foundation under Grant Number 23JRRA685.

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Author notes

  1. Xiaoni Du, Meichun Jia, Xiangyu Wang, and Jian Zou have contributed equally to this work.

Authors and Affiliations

  1. College of Mathematics and Statistics, Northwest Normal University, Anning East, Lanzhou, 730070, Gansu, China

    Ying Xu, Xiaoni Du, Meichun Jia & Xiangyu Wang

  2. Key Laboratory of Cryptography and Data Analytics, Northwest Normal University, Anning East, Lanzhou, 730070, Gansu, China

    Xiaoni Du

  3. Gansu Provincial Research Center for Basic Disciplines of Mathematics and Statistics, Northwest Normal University, Anning East, Lanzhou, 730070, Gansu, China

    Xiaoni Du

  4. College of Computer and Data Science, Fuzhou University, Fuzhou, 350108, Fujian, China

    Jian Zou

  5. Key Lab of Information Security of Network Systems, Fuzhou University, Fuzhou, 350108, Fujian, China

    Jian Zou

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  1. Ying Xu
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Correspondence to Xiaoni Du.

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Xu, Y., Du, X., Jia, M. et al. Quantum attacks on generalized Feistel networks based on the strong–weak separability. Quantum Inf Process 22, 375 (2023). https://doi.org/10.1007/s11128-023-04135-6

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