The paper describes the conception of security and analyses the implementation of the security for WAP with emphasis on the principle of security layer of WAP protocols (WTLS).
首先论述了安全性的概念，分析了WAP安全的实现模型； 重点讨论了WAP安全协议层WTLS的原理；
The paper presents the conception and the particularities of application-layer multicast, discusses and analyzes an application-layer multicast protocol NICE.
介绍了应用层多播的概念及其特点，讨论并分析了一种应用层多播协议NICE。
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