同态加密在隐私计算中的应用综述

Homomorphic encryption protocols and applications in privacy preserving computation

同态加密技术是一种基于数学难题的计算复杂性理论的密码学技术,支持数据以密态方式进行计算,计算结果解密后与明文计算的结果一致,在多样化复杂应用场景中具有很好的普适性,是目前隐私计算领域的一个热点研究方向。通过对同态加密技术的发展历程以及相关的技术路线进行梳理,解析了同态加密在安全求交、隐匿查询、多方联合计算、多方联合建模等典型隐私计算应用场景的技术融合应用,并对同态加密目前广泛落地应用过程中碰到的关键问题进行分析,最后对同态加密的研究发展方向进行探讨。

Homomorphic encryption is a cryptography technology based on the computational complexity theory of mathematical problems.It supports the calculation of data under the encrypted state,and the decrypted calculation result is consistent with the plaintext calculation result.As a hot research topic in privacy preserving computation,homomorphic encryption can be used in diverse application scenarios.We first introduce the development process of homomorphic encryption and relevant technologies.We then elaborate on the use cases of homomorphic encryption in typical application scenarios,such as secure intersection,secure querying,multi-party joint computing,and multi-party joint modeling.Finally,this paper analyzes and discusses the technical challenges and some research directions of current homomorphic encryption technologies.