Abstract: Based on the order preserving encryption method for numeric data, this paper proposes a fuzzy match encryption method for character data in the database. Encryption principle, process, algorithm property and robustness analysis are described. The experiment is done, and experiment results show that the method can improve robustness, and the response speed problem of query processing is solved effectively.

Key words: Database security, Database query, Encryption, Key management

摘要： 在分析数值型数据的保序加密方法的基础上，提出了一种针对字符数据的模糊匹配加密方法，阐述了其加密原理、过程、算法特性和鲁棒性。用实验进行了验证，实验结果表明该方法既提高了鲁棒性，又解决了查询处理的响应速度问题。

关键词: 数据库安全, 数据库查询, 加密, 密钥管理