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Paper 2019/951
Collisions on Feistel-MiMC and univariate GMiMC
Xavier Bonnetain
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.
Metadata
- Available format(s)
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- MiMCMPCsymmetric cryptanalysis
- Contact author(s)
- xavier bonnetain @ inria fr
- History
- 2019-08-21: received
- Short URL
- https://ia.cr/2019/951
- License
-
CC BY