Improved Threshold Signature Scheme CSI-FiSh with Fast Secret Recovery
Vadim V. Davydov, Altana Felixovna Khutsaeva, I. D. Ioganson, Jean-Michel Nikodemovich Dakuo, Sergey Valentinovich Bezzateev · The Herald of the Siberian State University of Telecommunications and Information Science · 2023
The paper presents an improved version of the CSI-FiSh threshold signature offered by L. De Feo and M. Meyer in 2020. In the proposed scheme, public and private keys are additionally updated avoiding the case of compromising a dealer. It is also proposed to eliminate the sequential information transfer between participants when signing and replace it with an assembly with the participation of the dealer. Experimental results showing the effectiveness of the proposed approach and the assessment of the resulting scheme safety are presented.