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Algebraic Attacks on Rasta and Dasta Using Low-Degree Equations
[article]
2021
IACR Cryptology ePrint Archive
Rasta and Dasta are two fully homomorphic encryption friendly symmetric-key primitives proposed at CRYPTO 2018 and ToSC 2020, respectively. We point out that the designers of Rasta and Dasta neglected an important property of the χ operation. Combined with the special structure of Rasta and Dasta, this property directly leads to significantly improved algebraic cryptanalysis. Especially, it enables us to theoretically break 2 out of 3 instances of full Agrasta, which is the aggressive version
dblp:journals/iacr/LiuIM21
fatcat:mtvkfa6kjvesbdoomskfucxhyi