在互联网环境中,信息安全正日益成为研究和关注的焦点。现有的安全技术,无论是密码算法和协议,还是更高层次的安全模型和策略,都与信任有所关联。研究计算机网络的学者则会把信任定义为数量化的信任程度,是相互通信中的一方对另一方的信赖程度的评价。由于互联网是一个规模庞大、复杂的系统,网络中正在通信的双方想要确立一种可靠的信任关系是很困难的事,因此信息安全专家设计了很多方案来解决这个问题。这些方法总体上可以分为两类:其一是通过信任关系的传递 In the Internet environment, information security is increasingly becoming the focus of research and attention. Existing security technologies, whether they are cryptographic algorithms and protocols, or higher-level security models and policies, are all associated with trust. Scholars working on computer networks define trust as a quantified level of trust, an assessment of the level of trust that one of the parties in the mutual communication has with the other. Because the Internet is a large and complex system, it is very difficult for the two communicating parties in the network to establish a reliable trust relationship. Therefore, information security experts have designed many solutions to this problem. These methods can be generally divided into two categories: one is the transfer of trust