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.de/patents/US20060040726?utm_source=gb-gplus-sharePatent US20060040726 - Method and system for authentication
