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文章概述了安全保密的含义及其重要性,评述了当前流行的几种数据库保密方法,诸如IMS的程序通信块控制方法,DBTG系统用子模式定义密码以及关系数据库系统的查询限制等,并着重论述了如何实施加密技术。文章专门讨论了数据库安全保密的新近发展和一些思路,其中有安全原子概念,通道问题,秘密等级的划分和授权,泄露策略和谓词控制等,最后还介绍了实验型的数据库计算机(DBC)的安全系统。作者特别强调分级保密原则的重要性,指出安全保密不应当成为方便使用计算机的障碍,并寄希望于数据库语义学为安全保密开辟新的道路。
The article summarizes the meaning and importance of security secrets, reviews several popular database security methods, such as IMS program communication block control method, DBTG system with sub-schema definition password and relational database system query constraints, and so on. Discusses how to implement encryption technology. The article discusses the recent development of database security and some ideas, including the concept of atomic safety, access problems, the classification and authorization of secret levels, the disclosure strategy and predicate control, and finally introduces the experimental database computer (DBC) Security system. In particular, the author emphasizes the importance of grading the principle of confidentiality, pointing out that security secrecy should not be an obstacle to the easy access to computers and hopes that database semantics will open up new avenues for security and confidentiality.