Paper 2022/991
Coefficient Grouping: Breaking Chaghri and More
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
Metadata
- Available format(s)
-
PDF
- Category
- Attacks and cryptanalysis
- Publication info
- A major revision of an IACR publication in EUROCRYPT 2023
- Keywords
- Chaghridegree evaluationcoefficient groupingoptimization problemfinite field
- Contact author(s)
-
liufukangs @ gmail com
ravianandsps @ gmail com
wanglibo12b @ gmail com
willimeier48 @ gmail com
takanori isobe @ ai u-hyogo ac jp - History
- 2023-02-21: last of 9 revisions
- 2022-08-03: received
- See all versions
- Short URL
- https://ia.cr/2022/991
- License
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CC BY
BibTeX
@misc{cryptoeprint:2022/991, author = {Fukang Liu and Ravi Anand and Libo Wang and Willi Meier and Takanori Isobe}, title = {Coefficient Grouping: Breaking Chaghri and More}, howpublished = {Cryptology {ePrint} Archive, Paper 2022/991}, year = {2022}, url = {https://eprint.iacr.org/2022/991} }