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:
Dec. 02, 2003
Filed:
Dec. 11, 1998
Michel Hazard, Mareil/Mauldre, FR;
Bull CP8, Louveciennes, FR;
Abstract
The invention relates to a process for storing and using sensitive information in a security module and to a security module arranged to implement the process, and protect the sensitive information against fraudulent utilization. The sensitive information ISj is stored in a form {overscore (ISj)} encrypted using a temporary encrypting protection key CPi, whose content varies over time. The sensitive information {overscore (ISj)} is decrypted before being used in a given operation, using a temporary decrypting protection key CPid. Before the contents of the encrypting and decrypting keys are varied, the sensitive information {overscore (ISj)} is decrypted with the current decrypting key, and then it is re-encrypted with the new encryption key to obtain a new encrypted form, different from the previous one.