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A party-adaptive variant of LowGear
Journal of Information Security and Applications ( IF 5.6 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.jisa.2021.102763
Yanbin Li , Yu Liu , Yongheng Dai , Pengda Wang

Over the last decade, secure multi-party computation (MPC) has made a great stride from a major theoretical area to the multi-functional tool for building privacy protection applications. At EUROCRYPT’18, Keller et al. presented MPC protocol LowGear based on semi-homomorphic (addition-only) encryption. Due to its superior performance and high availability, LowGear has drew a lot of attention from industry. But in practical application environment, there are still requirements that LowGear does not satisfy. A major drawback is the inability to handle changes in the set of parties during online computing phase.

In this paper, we present a party-adaptive variant to LowGear, with the goal to continue secure collaborative computing tasks when some new parties join in, some old parties drop out, or new parties replace old ones. This variant is based on tweaks to preprocessing phase to adapt existing preprocessed data to the computation over a new set of parties without regenerating new data by rerunning the entire preprocessing phase. It can effectively avoid the waste of data and time resources. Meanwhile the variant does not reduce security and efficiency of LowGear.



中文翻译:

适用于聚会的LowGear变体

在过去的十年中,安全多方计算(MPC)从主要的理论领域到用于构建隐私保护应用程序的多功能工具取得了长足的进步。在EUROCRYPT'18,Keller等人。提出了基于半同态(仅加法)加密的MPC协议LowGear。由于其出色的性能和高可用性,LowGear引起了业界的广泛关注。但是在实际应用环境中,仍然存在LowGear无法满足的要求。一个主要的缺点是无法在在线计算阶段处理一组参与者的更改。

在本文中,我们提出了LowGear的一种适应聚会的变体,其目标是当一些新的聚会加入,某些旧的聚会退出或新的聚会替换旧的聚会时继续安全的协作计算任务。此变体基于对预处理阶段的调整,以使现有的预处理数据适应新的一组参与者的计算,而无需通过重新运行整个预处理阶段来重新生成新数据。它可以有效避免浪费数据和时间资源。同时,该变体不会降低LowGear的安全性和效率。

更新日期:2021-02-16
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