Reference

waelchatila.com - Using AJAX for Image Passwords - AJAX Security Part 1 of 3
http://waelchatila.com/2005/09/18/1127075317148.html

via

cl.pocari.org - Ajax を使ったマウスジェスチャ認証
http://cl.pocari.org/2005-12-26-1.html