Patent ID: 8347105

Claim:
A method for obtaining a PIN validation signal in a data processing unit, the method comprising: receiving, in a portable object, a PIN directly from a data entering interface such that said PIN can be verified; verifying, in the portable object, the received PIN; replacing, in the portable object, the received PIN with a fake PIN; storing, in the portable object, said fake PIN; transmitting said fake PIN, upon verification of said received PIN, from the portable object to the data processing unit, said data processing unit viewing said fake PIN as a PIN having been received by said data entering interface and still requiring verification by said portable object; transmitting the fake PIN from the data processing unit, to the portable object for verification; comparing, in said portable object, said fake PIN received from the data processing unit with the fake PIN stored in the portable object; and when a result of the comparing indicates that said fake PIN received from the data processing unit corresponds to the fake PIN stored in the portable object, returning a validation signal, from the portable object, to the data processing unit.