The strategy first improves the key expansion of AES encryption algorithm method KeyExpansion ,and according to the actual demand the database information is divided into sensitive data,non⁃sensitive data,sensitive keywords and non⁃sensitive keywords. Then by means of the improved AES algorithm two times of nested encryption of sensitive data are done,sensitive keywords are encrypted using the improved AES algorithm to ensure the security of database. By using DES algorithm,the non⁃sensitive data and non⁃sensitive keywords are encrypted to ensure the efficient operation of the database. Finally,through Java language the strategy of encryption software and the actual application are realized. The strategy advantages in the safety,high efficiency and easy realization are proved in application.%该策略首先改进了AES加密算法的密钥扩展方法KeyExpansion，并根据实际需求将数据库信息划分为敏感数据、非敏感数据、敏感关键字和非敏感关键字；然后通过改进的AES算法对敏感数据进行二次嵌套加密，对敏感关键字使用改进的AES算法加密以保证数据库的安全性；使用DES算法对非敏感数据和非敏感关键字进行加密保证了数据库操作的高效性能；最后通过java语言实现了该策略的加密软件并投入实际应用。在应用中证明了该策略在安全性、高效性及易实现性方面的优势。
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