基于ElGamal的同态云端密文存储检索方案

云端数据存储的安全性和检索效率是网络空间安全亟待解决的问题之一.本文提出了一个新的密文检索模型,并在此基础上利用ElGamal同态密码算法和SM4分组密码算法,设计了一种基于混合同态加密的云端密文存储检索方案.首先,该检索方案能够在数据上传、检索和下载的过程中,保证数据的安全,可用于个人云端U盘等应用场景.其次,对该方案的正确性和安全性进行分析.最后,通过实验的方式对方案的正确性进行了证明.实验结果表明该方案在保证数据安全的情况下,检索结果正确,效率高.

Homomorphic Cloud Ciphertext Storage and Retrieval Scheme Based on ElGamal

The security and efficiency of cloud data storage are urgent issues to be solved in cyberspace security. Therefore, a new ciphertext retrieval model is proposed in the study, and on this basis, the ElGamal homomorphic cipher algorithm and SM4 block cipher algorithm are used to design a cloud ciphertext storage and retrieval solution based on hybrid homomorphic encryption. The retrieval solution can ensure data security during data uploading, retrieving, and downloading and can be applied to personal cloud USB drives and other application scenarios. Moreover, the correctness and safety of the scheme are analyzed and proved through experiments. The experimental results reveal that the scheme can assure correct retrieval results with high efficiency while ensuring data security.