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讨论了利用Ｘ．４００建议中所定义的安全元素之一：令牌（包括文电令牌和连接令牌）来提供ＭＨＳ所需的安全功能的途径和方法，分析了用Ｘ．５０９鉴别框架来实现Ｘ．４００所需的密钥管理的过程；同时也指出Ｘ．４００的令牌结构及实现过程中存在的一些问题，并针对这些问题提出了相应的解决办法和思路．
Discussed the use of X. One of the security elements defined in the 400 Recommendation: Ways and Means for Providing Security Functions Needed by MHS for tokens, including both messaging and connection tokens, is analyzed using X. 509 authentication framework to achieve X. 400 required key management process; also pointed out X. 400 token structure and some problems existing in the process of implementation, and put forward corresponding solutions and ideas for these problems.