Daemon, SSL, TLS, and many web knowledge

http://en.wikipedia.org/wiki/Daemon_(computer_software)
http://en.wikipedia.org/wiki/Secure_Sockets_Layer
http://en.wikipedia.org/wiki/Transport_Layer_Security
http://gec.kmu.edu.tw/~tjm/security/sec9/img0.html
http://en.wikipedia.org/wiki/Eavesdropping
http://en.wikipedia.org/wiki/Message_forgery
http://en.wikipedia.org/wiki/Information_security
http://en.wikipedia.org/wiki/Cryptography
http://en.wikipedia.org/wiki/Mutual_authentication
http://en.wikipedia.org/wiki/Smtp
http://140.127.138.46/tsnien/Teach_Manu/F8745/F8745_HTML/chap11/chap11-t.htm