http://www.sslshopper.com/
http://www.ibaohost.com/node/134
http://blog.wantssl.com/
https://baoz.net/tag/ssl/
http://blog.csdn.net/kunoy/article/details/8239653
http://www.cyberciti.biz/faq/nginx-self-signed-certificate-tutorial-on-centos-redhat-linux/
http://www.sslshopper.com/article-how-to-make-a-secure-login-form-with-ssl.html