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在一个包含有若干个节点的通信网络中,遇到的威胁通常分为有意和无意两大类。其中特别严重的有: —通过无保护能力的输入口盗走用户通行字和传送过的信息; —利用盗来的用户通行字非法进入网络,以便进一步盗走网络中的资源; —利用盗来的信息或信息形式来变更信息或伪造信息送入网络,以破坏网络中的资源。
In a communication network containing several nodes, the threats encountered are usually divided into two major categories: intentional and unintentional. Of particular concern are theft of user passwords and transmitted messages through unprotected input ports; unauthorized use of stolen user passwords to gain access to the network in order to further steal network resources; The form of information or information to change the information or fake information sent to the network in order to undermine the network resources.