“互联网+”催生了许多新的经济形态与商业模式,公有云面临着严峻的安全挑战.研究了公有云数据安全问题,并提出了研究思路.首先,分析了同态加密的概念、加法同态加密与乘法同态加密的特点以及当前的研究成果和需要解决的难题.然后,根据乘法同态加密算法、散列表和相似性理论,提出了一种数据安全保护方案,并阐述了具体实现流程,采用欧氏距离检验公有云中加密数据的相似性与完整性.最后,理论分析了该方案的正确性与安全性.仿真实验验证了该方案的可行性与有效性.%"Internet plus" has given birth to many new economic forms and business models,the public cloud faces a serious security challenges.The security of public cloud data was studied and the research ideas were put forward.Firstly,the concept of homomorphic encryption,the characteristics of additive homomorphic encryption and multiplicative homomorphic encryption,and the current research results and difficult problems to be solved were analyzed.Then,based on the multiplicative homomorphic encryption algorithm,hash table and similarity theory,a data security protection scheme was proposed,and the concrete realization process was described.The similarity and completeness of the encrypted data in the public cloud were tested by Euclidean distance.Finally,the correctness and security of the scheme were analyzed by theory.The simulation results verify the feasibility and validity of the scheme.
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