Welcome to the resource topic for 2023/1283
Title:
Algebraic Cryptanalysis of Full Ciminion
Authors: Augustin Bariant
Abstract:With the increasing interest for advanced protocols for Multi Party Computation, Fully-Homomorphic Encryption or Zero Knowledge proofs, a need for cryptographic algorithms with new constraints has emerged. These algorithms, called Arithmetization-Oriented ciphers, seek to minimize the number of field multiplications in large finite fields \mathbb{F}_{2^n} or \mathbb{F}_{p}. Among them, Ciminion is an encryption algorithm proposed by Dobraunig et al. in Eurocrypt 2021.
In this paper, we show a new univariate modelization on a variant of Ciminion proposed by the designers. This instance restricts the attacker to at most 2^{s/2} data, where s is the security level. Because the designers chose to reduce the number of rounds in that specific attacker model, we are able to attack the cipher for large security levels. We also propose some slight modifications of Ciminion that would overcome this vulnerability.
ePrint: https://eprint.iacr.org/2023/1283
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .