个人觉得很不错的简单代码，用很少的程序实现，非常值得一看...

ENIGMA3模拟WW II加密算法-ENIGMA3 simulation WW II encryption algorithm

base64码转换程序,不够完善-base64 code conversion, not perfect

比较流行的md5的加密方法!-more popular encryption methods md5!

cox方法展频水印matlab源码，对bitmap图像隐藏信息-frequency watermarking method Show Matlab source of bitmap images for hidden messages

des，c环境下的，希望站长早日通过，贵站的宝贵资料对于我的学习有很大的帮助，感谢！-des, under the c environment, hoped stationmaster soon will pass, the expensive station precious material will have the very big help regarding mine study, the thanks!

vc++6.0下的md5源程序-vc 6.0 source of md5

用Caesar算法实现文本加密的程序

穷举型密码破译器。可以自定义词典，多线程。visual c++6.0 xp/2-exhaustive type code-breaking device. You can define Dictionary, multithreading. Visual c 6.0 xp/2

提供服务端登陆验证程序（验证码随机改变，防止非法进入）； 提供服务器控制程序，管理员可以允许、屏蔽和删除一个注册用户的登陆客户端； 任何改变访问地点的行为，都必须得到管理员的授权，否则无法登陆系统； 即使知道其他用户的密码也不能登陆系统。-provide certification services-landing procedures (Random Verification code change to prevent illegal entry); Provide server control procedures, administrators can allow, shielding and delete a user"s landing client; Any change in location of the visit have to be authorized administrators, whether while not landing systems; even if they know the password for other users can not landing system.

一个通过控制系统时间来达到限制软件使用期限的算法程序-A system by controlling the time limit is reached, the software algorithm program using the term