这是一个linux下监控vpn状态的程序，可以实时监控vpn隧道当前状态信息，包括（协商密钥，传输数据统计等）-This is a linux VPN under state control procedures, Real-time monitoring can VPN tunnel current state of information, including (key consultations, the data transmission, etc.)

采用win32 SDK编写的局域网即时聊天程序，实现了文本聊天，语音聊天，文件传输，传输加密，密钥自动协商功能。-Prepared using win32 SDK LAN instant messaging program, to achieve a text chat, voice chat, file transfer, transmission encryption, key auto-negotiation function.

在线售书网站，用户登录，注册等模块实现密钥协商和加密传输，包含RSA 和 DES 的php和JS两个版本，压缩包内含有数据库文件。很适合初学者。 -Online book sites, user login, registration and other modules to achieve key negotiation and encrypted transmission, including RSA and DES are two versions of php and JS, compr