| 摘要 |
A method of and system for authenticating a personal authentication store such as a prepayment card for use in authentication the identity of a user is described. The method comprises generating a challenge by: receiving a unique identifier of the personal authentication store; identifying first and second subsets of predetermined data elements using the unique identifier; selecting a data element from the first subset and transmitting the data element to the user as an authentication challenge. Each subset has been previously selected from a corresponding larger set of the data elements and each data element of the first subset corresponds to a specific one of the data elements of the second subset. The authentication is determined by receiving a response to the authentication challenge from the user that has been determined by use of information provided on the personal authorisation store; and issuing an authentication signal if the response comprises the specific data element of the second subset that corresponds to the data element of the first subset used for the challenge. |
