A secure user authentication system, operable over a client-server communications network to authenticate a system user. The system includes an application server which includes a site which is able to be enabled, and an authentication server, which is able to enable the application server site. The...http://www.google.com.hk/patents/US7861077?utm_source=gb-gplus-share專利 US7861077 - Secure authentication and transaction system and method
