常见的对称加密算法

1.rsa

http://orangeholic.iteye.com/blog/2161771

http://blog.csdn.net/clh604/article/details/20224735

2.des

http://blog.csdn.net/yanfangphp/article/details/8207050

http://it.oyksoft.com/post/4831/

3.aes

http://www.oschina.net/code/snippet_248412_15378