安全操作系统研究的发展(下)

The Development of Research on Secure Operating Systems(2)

6 动态政策时期[0] 从单一政策支持到多种政策支持,安全操作系统迈出了向实际应用环境接近的可喜一步.然而,R.Spencer等指出[17],从支持多种安全政策到支持政策灵活性,还有相当一段距离.政策灵活性是动态政策时期的重要特征,1999年,Flask系统的诞生是动态政策时期的帷幕徐徐打开的标志.

Prior to the work of this paper, our knowledge of the evolution history of secure operating systems was limited and primarily anecdotal. This paper proposes a classification method which divides the progress process of the research on secure operating systems into foundation period, cookbook period, multi-policy period and dynamic-policy period. The originating and developing procedure of the fundamental concepts. technologies and methods of secure operating systems is analyzed systematically according to the proposed classification method. As a result, a comprehensive perspective of the evolution course of the research on secure operating systems is presented. The discussion of the topic in question consists of two parts. This is the secont part.