Access control to data processing means

US8583934B2 · kind B2 · utility

Assignee

• GEMALTO SA · FR

Inventors

• Christophe Bidan · Cesson-Sévigné, FR
• David Naccache · Paris, FR
• Pierre Girard · La Destrousse, FR
• Pascal Guterman · Aubagne, FR
• Ludovic Rousseau · Aubagne, FR

Key dates

• Filing date: Jun 20, 2001
• Grant date: Nov 12, 2013
• Expiry date: May 4, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G07F7/1025
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method for preventing secret code manipulation in a data processing device, such as a smart card, to which a presented code is applied. Prior to implementation of a code transforming function in the processing device, the secret code is transformed into a transformed secret code in the card. For each use of the card, the presented code is transformed into a transformed presented code in accordance with the implemented transformation function. A comparison of the transformed secret code with the transformed secret code in the card is then performed.