[Resource Topic] 2022/1169: DyCAPS: Asynchronous Proactive Secret Sharing for Dynamic Committees

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DyCAPS: Asynchronous Proactive Secret Sharing for Dynamic Committees

Authors: Bin Hu, Zongyang Zhang, Han Chen, You Zhou, Huazu Jiang, Jianwei Liu


Dynamic-committee proactive secret sharing (DPSS) enables the update of secret shares and the alternation of shareholders, which makes it a promising technology for long-term key management and committee governance. However, there is a huge gap in communication costs between the state-of-the-art asynchronous and non-asynchronous DPSS schemes. In this paper, we fill this gap and propose the first practical DPSS scheme, DyCAPS, with a cubic communication cost w.r.t. the number of shareholders.
DyCAPS can be efficiently integrated into existing asynchronous BFT-based blockchains to support the member change in BFT committees, without increasing the overall asymptotic communication cost. The experimental results show that DyCAPS introduces acceptable latency during the reconfiguration of the committees.

ePrint: https://eprint.iacr.org/2022/1169

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