The present invention provides methods and devices for controlling the authentication and ciphering procedures in digital communication devices. In the invention, a means for transmitting and receiving radio signals is connected with a processing unit. A. SIM is provided that contains authentication...http://www.google.com.tw/patents/US6356753?utm_source=gb-gplus-share專利 US6356753 - Management of authentication and encryption user information in digital user terminals
