如何安全而有效地對數據庫信息進行加密保護是目前迫切需要解決的課題。本文提出
一種基于DBMS擴展的數據庫加密系統，系統通過對DBMS進行擴展實現加解密功能，并向用戶提供可選擇的字段加密。系統透明性好，并且較好地解決了不同用戶對數據加密的不同要求，具有一定的實際意義。
關鍵字：數據庫；加密；DBMS

Design and Implementation of Database Encryption System Based on DBMS Expanding WANG Xinchang，WANG Yongwei （Institute of Electronic Technology, People’s Liberation Army Information Engineering University, Zhengzhou 450004, China） Abstract：How to encrypt and protect information in database safely and effectively has become a problem we must settle exactly．A database encryption system based on DBMS expanding is put forwarded in this paper, which implements the encryption and decryption function through DBMS expanding and provides optional fields encrypting for users. This system has good transparence and meets different user's data encrypting needs.
Key words: database；encryption；DBMS；