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- W4365808218 abstract "We propose an efficient technique called coefficient grouping to evaluate the algebraic degree of the FHE-friendly cipher Chaghri, which has been accepted for ACM CCS 2022. It is found that the algebraic degree increases linearly rather than exponentially. As a consequence, we can construct a 13-round distinguisher with time and data complexity of $$2^{63}$$ and mount a 13.5-round key-recovery attack. In particular, a higher-order differential attack on 8 rounds of Chaghri can be achieved with time and data complexity of $$2^{38}$$ . Hence, it indicates that the full 8 rounds are far from being secure. Furthermore, we also demonstrate the application of our coefficient grouping technique to the design of secure cryptographic components. As a result, a countermeasure is found for Chaghri and it has little overhead compared with the original design. Since more and more symmetric primitives defined over a large finite field are emerging, we believe our new technique can have more applications in the future research." @default.
- W4365808218 created "2023-04-16" @default.
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- W4365808218 date "2023-01-01" @default.
- W4365808218 modified "2023-10-16" @default.
- W4365808218 title "Coefficient Grouping: Breaking Chaghri and More" @default.
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- W4365808218 doi "https://doi.org/10.1007/978-3-031-30634-1_10" @default.
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