20090235074 | SYSTEM AND METHOD FOR PERFORMING A TRANSACTION - A system for performing a transaction comprises a terminal adapted to perform a transaction required by a user, user authentication means and a transaction server adapted to communicate with the terminal. The user authentication means comprise a first and a second authentication device adapted to communicate with the terminal through respectively a first communication channel and second communication channel and comprise storage means for storing respective first and second user authentication keys. The transaction server comprises storage means for storing, for each of the authentication devices, respective first and second server authentication keys. In particular, the first authentication keys are distinct from the second authentication keys. | 09-17-2009 |