Java数字签名,当然每个客户端还是需要安装JRE的，不过现在的浏览器安装时都已经自动安装了-Digital Signature Java, of course, each client will still need to install the JRE. But now the browser already installed in the automatic installation

csma/cd 模拟 其余的自己看吧-csma/cd simulate the rest of their own and see

一个javax写的关于CSMA的模拟,有pure Aloha,One persist,p-persist,和non-persist的模拟，不过后面几个的模拟自己不怎满意-CSMA simulation with Java. include pure Aloha,One persist,p-persist,和non-persist.

无限局域网MAC层的CSMA协议的三种实现方法，使用java完成，三种分别是NonePersistent，NonePersistent1和OnePersistent，是无线MAC设计的良好参考代码-Wireless network CSMA implementation using Java，containing NonePersistent，NonePersistent1 and OnePersistent，very useful when designing MAC layer protoc

Java Applet数字签名 -Java Applet Java Applet digital signature digital signature