An improved computer network security system and a personal identifier device used for controlling network with real time authentication of both a person's identity and presence at a computer workstation is provided. A new user is registered to a portable personal digital identifier device and, within...http://www.google.com.hk/patents/US7310734?utm_source=gb-gplus-share專利 US7310734 - Method and system for securing a computer network and personal identification device used therein for controlling access to network components
