Method for authenticating an external authorizing datum by a portable object, such as a memory card

US4907272A · kind A · utility

Assignee

• Bull CP8 · FR

Inventors

• Michel Hazard · Aubergenville, FR
• Michel Ugon · Maurepas, FR

Key dates

• Filing date: Mar 10, 1988
• Grant date: Mar 6, 1990
• Expiry date: Mar 10, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L9/3234
• WIPO field: IT methods for management
• WIPO sector: Electrical engineering

Abstract

The invention relates to a method for authenticating an external authorizing datum by a portable object, such as a memory card. The authorizing datum (C1) entered into an apparatus (2) is enciphered with a predetermined datum (E) to yield a message (M) which is transmitted to a portable object (1). The object (1) deciphers the message (M), taking into account a reference authorizing datum (C1), in order to retrieve a datum (E'), which must be coherent with the datum (E). The invention applies in particular to the recognition of the carrier code of the owner of a credit card.