Interactive authentication process

摘要

A method of authenticating a person or device, the method comprising the steps of storing a plurality of formulae at a smart card 1 and at a central computer 6. A random number is generated at the central computer 6 and identifies one of said formulae. The random number is then sent to the smart card 1. At the smart card 1, a result is computed using at least the formula identified by the received random number. The computed result is sent to the central computer 6. At the central computer 6, the person or device is authenticated by comparing the received result against a result computed at central computer 6 using said random number and the formulae stored at the central computer.