一个用java编的可以跨系统传输文件的工具，在linux下也有可视化解面-java with a series of cross-system can be a tool for document transmission, but also under linux resolve surface visualization

信息安全实现一个简单的数字签名系统 ，能够进行简单的文件下载与传输(The realization of a simple digital signature system of information security, can download files and simple transmission)