关键词: 散列算法, MD5算法, 敏感数据, 篡改检测

Abstract: This paper presents a method that can discover effectively the modification of sensitive data in database by using one-way hash algorithm that cannot be deduced inversely，because it is difficult to detect the illegal revision of sensitive data.The dual inspection approach is adopted through checking client and server for better detection effect.The MD5 algorithm，a one-way hash algorithm，is improved availably by adding a hidden ‘antibody’ factor to the algorithm for withstanding cribber’s exhaustion search.The paper mainly describes the principle of this method based on the improved MD5 algorithm and how to realize it in the application system.Applied results demonstrate that this method has highly sensitive to intentional tampering and outstanding detection performance for data tamper detection.

Key words: hash algorithm, MD5, sensitive data, tamper detection