Breaking Bicoptor from S$\&$P 2023 Based on Practical Secret Recovery Attack

ePrint Report: Breaking Bicoptor from S$\&$P 2023 Based on Practical Secret Recovery Attack

Jun Xu, Zhiwei Li, Lei Hu

At S$\&$P 2023, a family of secure three-party computing protocols called Bicoptor was mainly proposed by Huawei Technology in China, which is used to compute non-linear functions in privacy preserving machine learning. In these protocols, two parties $P_0, P_1$ respectively hold the corresponding shares of the secret, while a third party $P_2$ acts as an assistant. The authors claimed that neither …

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