Design of embedded secure CGI daemon

This paper describes the technical details of design and implementation of an embedded secure CGI daemon, which not only is a CGI program residing permanently in memory but also integrates a CGI based secure HTTP server which is dedicated to support CGI specification. The content of the pager consists mainly of two parts, of which the first is designing of CGI based secure HTTP server, including SSL and HTTP programming, and generating and downloading of self-signed certificate, while the second is designing of CGI daemon including CGI programming and the mainly used techniques, such as secure login, CAPTCHA, password getting back, etc. A practical embedded application system is provided as demo example to show the usage and effects of the secure CGI daemon.