With the improvement of network,security becomes more importable. In market,firewall is one of the importable security products. Firewall can prevent your network from being attacked,for example IP snoop,mail-spm etc....
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With the improvement of network,security becomes more importable. In market,firewall is one of the importable security products. Firewall can prevent your network from being attacked,for example IP snoop,mail-spm etc. But firewall can not prevent itself from the action which attacks the firewall's code and firewall system. So we add integrity services into firewall system. In firewall system,every module does self-check integrity before it is loaded by system. A bilateral authentication procedure is designed for two modules which call each other to establish trust in the identity and integrity of each other. And it is still necessary to ensure secure linkage between the two parties. Firewall system establishes on the security data architecutre.
安全性和灵活性是各种改进的BLP模型追求的目标.如何在保持安全性的前提下增加BLP模型的灵活性,一直是安全操作系统研究人员研究的重点.安全模型是系统设计的基础,如果在系统中实现了不安全的“安全模型”,其后果是严重的.结合多级安全(MLS)的核心思想,通过实例列举的方式深入分析了两个改进的BLP模型——DBLP(dynamic BLP)和SLCF(security label common framework).尽管这两个模型都提出了在系统运行时动态地调整主体安全级的规则,但是分析表明,它们还是不安全的.在这两个模型的规则控制下,特洛伊木马可以通过显式地读和写操作将高安全等级的信息泄漏给低安全等级的主体,从而违反了多级安全(MLS)策略.研究结果为人们避免选用不安全的模型提供了有意义的理论支持.
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