CryptoDB
General Practical Cryptanalysis of the Sum of Round-Reduced Block Ciphers and ZIP-AES
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| Conference: | ASIACRYPT 2024 |
| Abstract: | We introduce a new approach between classical security proofs of modes of operation and dedicated security analysis for known crypt- analysis families: General Practical Cryptanalysis. This allows us to ana- lyze generically the security of the sum of two keyed permutations against known attacks. In many cases (of course, not all), we show that the se- curity of the sum is strongly linked to that of the composition of the two permutations. This enables the construction of beyond-birthday bound secure low-latency PRFs by cutting a known-to-be-secure block cipher into two equal parts. As a side result, our general analysis shows an in- evitable difficulty for the key recovery based on differential-type attacks against the sum, which leads to a correction of previously published at- tacks on the dedicated design Orthros |
BibTeX
@inproceedings{asiacrypt-2024-34586,
title={General Practical Cryptanalysis of the Sum of Round-Reduced Block Ciphers and ZIP-AES},
publisher={Springer-Verlag},
author={Antonio Florez Gutierrez and Lorenzo Grassi and Gregor Leander and Ferdinand Sibleyras and Yosuke Todo},
year=2024
}