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Cryptanalysis of MPC/FHE/ZK-friendly ciphers and Open problems

组织者

张英杰

演讲者

刘富康

时间

2024年06月27日 15:30 至 16:30

地点

A3-2-303

线上

Zoom 559 700 6085 (BIMSA)

摘要

MPC/FHE/ZK-friendly symmetric-key primitives have attracted lots of researchers’ interest in academic and industry. For instance, the MPC-friendly primitives have been used to design post-quantum signature schemes based on the MPC-in-the-head technique, and ZK-friendly hash functions can be used to improved some blockchain’s performance. Different from traditional symmetric-key ciphers, many of them are designed over a large finite field (also called AO ciphers), which makes many traditional cryptanalytical techniques fail to apply. In this report, I will briefly introduce a series of my work on the cryptanalysis of these ciphers, like Chaghri, RAIN, AIM, Friday, Rasta, HEAR. I expect that my experience in the analysis of these ciphers can be helpful to the researchers interested in this research topic, and the developed techniques can shed new insight into MPC/FHE/ZK-friendly ciphers. At last, I will also give some interesting open problems worth further study.