The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 2009
Filed:
Mar. 11, 2003
Eric Desmicht, Caen, FR;
Stéphane Mutz, Caen, FR;
Christophe Tison, Douvres la Delivrande, FR;
NXP B.V., Eindhoven, NL;
Abstract
The invention relates to a secure data processing system including an unscrambling module [DSC] disposed on a dedicated hardware part [HW] of an integrated circuit and intended to unscramble a stream of data [SP] scrambled according to a scrambling key, a module [CM] for calculating an unscrambling key [Kp] disposed on said dedicated hardware part [HW] and intended to manipulate data under the control of a so-called calculation program stored on said dedicated hardware part [HW], a processor [CPU] for in particular controlling the functioning of the unscrambling [DSC] and calculation [CM] modules. Said system also includes a read only memory [SME] disposed on said dedicated hardware part [HW] for storing a secret key [Kp]. Said calculation program includes instructions for prompting said calculation module [CM] to use said secret key [L] and at least one data item [AC[n,p] or Kpc)] coming from outside the secure data processing system, in order to calculate an unscrambling key [Kp]. The unscrambling is enabled only if the unscrambling key [Kp] corresponds to the scrambling key.