基于f-mOPE的数据库密文检索方案

在云数据库环境下，为保证云存储数据的安全性，通常将数据加密存储。针对加密存储数据查询开销大，不支持密文排序，查询等缺点，该文提出一种 f-mOPE数据库密文检索方案。该方案基于可变保序编码(mOPE)，采用二叉排序树数据结构思想，生成明文一一对应的保序编码；基于AES加密方案将数据明文转化为密文存储；采用改进的部分同态加密算法提升保序加密方案的安全性。通过安全性分析及实验结果表明，该方案在保证数据隐私的基础上，不但能抵御统计型攻击，而且能够有效地降低服务器计算开销，提高数据库处理效率。

Database Ciphertext Retrieval Scheme Based on f-mOPE

In a cloud database environment, data is usually encrypted and stored to ensure the security of cloud storage data. To overcome the shortcomings of encrypting the data that the query overhead is big, the cipher text sortings and query are not support, etc, this paper puts forward a kind of f - mOPE cryptograph database retrieval scheme. Based on the mOPE sequential encryption algorithm, the idea of binary sort tree data structure is used to generate plaintext one-to-one corresponding sequential coding. Data plaintext is converted into ciphertext storage based on the AES encryption scheme. The improved partial homomorphic encryption algorithm is used to improve the security of sequential encryption scheme. The security analysis and experimental results show that this scheme can not only resist statistical attack, but also reduce effectively server computing cost and improve database processing efficiency on the basis of guaranteeing data privacy.