PROCESS FOR AUTHENTICATING EXTERNAL CLEARANCE DATA BY A PORTABLE OBJECT SUCH AS A MEMORY CARD

摘要

The clearance data (C1) entered into a device (2) is ciphered with a predetermined item of information (E) in order to give a message (M) which is transmitted to a portable object (1). The object (1) deciphers the message (M) taking into account reference clearance data (C1) in order to retrieve information (E'), which must be consistent with information (E). The invention is applicable in particular to recognition of the carrier code of the bearer of a credit card.