Embodiments of the present invention provide a method and system for authentication. In one embodiment, a first identifier associated with an item to be authenticated may be received. A first decryption key associated with the item may also be received. The first identifier may be decrypted using the...http://www.google.com.tw/patents/US7749080?utm_source=gb-gplus-share專利 US7749080 - Method and system for authentication
