# Collisions on Feistel-MiMC and univariate GMiMC

Abstract : MiMC and GMiMC are families of MPC-friendly block ciphers and hash functions. In this note, we show that the block ciphers MiMC-2n/n (or Feistel-MiMC) and univariate GMiMC are vulnerable to an attack which allows a key recovery in $2^{n/2}$ operations. This attack, which is reminiscent of a slide attack, only relies on their weak key schedules, and is independent of the round function ($x^3$ here) and the number of rounds.
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Cited literature [5 references]

https://hal.inria.fr/hal-02400343
Contributor : Xavier Bonnetain <>
Submitted on : Monday, December 9, 2019 - 2:34:19 PM
Last modification on : Saturday, December 21, 2019 - 1:14:43 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 6:45:07 PM

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mimc-collision.pdf
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• HAL Id : hal-02400343, version 1

### Citation

Xavier Bonnetain. Collisions on Feistel-MiMC and univariate GMiMC. 2019. ⟨hal-02400343⟩

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