Paper 2022/464

Superposition Attacks on Pseudorandom Schemes based on Two or Less Permutations

Shaoxuan Zhang, Chun Guo, and Qingju Wang


We study quantum superposition attacks against permutation-based pseudorandom cryptographic schemes. We first extend Kuwakado and Morii's attack against the Even-Mansour cipher (ISITA 2012), and exhibit key recovery attacks against a large class of pseudorandom schemes based on a single call to an $n$-bit permutation, with polynomial $O(n)$ quantum steps. We also show how to overcome restrictions on available quantum data in certain relevant settings. We then consider TPPR schemes, namely, Two Permutation-based PseudoRandom cryptographic schemes. Using the improved Grover-meet-Simon method of Bonnetain et al. (ASIACRYPT 2019), we show that the keys of a wide class of TPPR schemes can be recovered with $O(n)$ superposition queries and $O(n2^{n/2})$ quantum steps. We also exhibit sub-classes of "degenerated" TPPR schemes that lack certain internal operations, and exhibit more efficient key recovery attacks using either the Simon's algorithm or Chailloux et al.'s algorithm for collision searching (ASIACRYPT 2017). Further using the all-subkeys-recovery idea of Isobe and Shibutani (SAC 2012), our results give rise to key recovery attacks against several recently proposed permutation-based PRFs, as well as the 2-round Even-Mansour ciphers with generic key schedule functions (Chen et al., JoC 2018) and their tweakable variants (Cogliati et al., CRYPTO 2015). From a constructive perspective, our results establish new quantum Q2 security upper bounds for two permutation-based pseudorandom schemes as well as sound design choices.

Note: Submitted to Designs, Codes and Cryptography in 02 Feb 2022.

Available format(s)
Secret-key cryptography
Publication info
Preprint. Minor revision.
Quantum attackspermutation-based cryptographytweakable blockcipherPRF
Contact author(s)
chun guo @ sdu edu cn
2022-04-22: received
Short URL
Creative Commons Attribution


      author = {Shaoxuan Zhang and Chun Guo and Qingju Wang},
      title = {Superposition Attacks on Pseudorandom Schemes based on Two or Less Permutations},
      howpublished = {Cryptology ePrint Archive, Paper 2022/464},
      year = {2022},
      note = {\url{}},
      url = {}
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