Bang

介绍了jca框架，以及使用java完成md5, scha-1等摘要算法，以及java来实现des,aes等对称加密，实现rsa非对称加密啊，还有证书等

Understanding COM takes time and energy. I can say with great confidence that there is always more to learn. However, as with most technologies, COM does provide a core body of knowledge that works as the backbone for just about everything else. For example, once you understand the building blocks of interfaces, coclasses, class factories, and COM binaries, the foundation is laid for numerous related aspects of COM, such as the ActiveX control, distributed COM, and connectable objects (just to name a few).