计算机科学 ›› 2022, Vol. 49 ›› Issue (11): 345-350.doi: 10.11896/jsjkx.210900047
朱宗武, 黄汝维
ZHU Zong-wu, HUANG Ru-wei
摘要： 针对目前基于全同态加密的安全多方计算协议存在的密文尺寸大、效率较低的问题,文中证明了Chen等提出的支持多比特加密的全同态加密方案满足密钥同态性,基于该方案和门限解密设计了一个在公共随机串模型下的3轮交互的高效安全多方计算协议。该协议由非交互的零知识证明可以得出协议在恶意模型下是安全的,其安全性可归结为容错学习问题的变种问题Some-are-errorless LWE。与现有的在CRS模型下的协议相比,该协议支持多比特加密,能有效降低与非门复杂度;同时密文尺寸较小,减少了运算量,从而提高了时间与空间效率。
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