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:
Nov. 10, 2009
Filed:
Aug. 14, 2003
Corinne Le Buhan, Les Paccots, CH;
Rached Ksontini, Lausanne, CH;
Corinne Le Buhan, Les Paccots, CH;
Rached Ksontini, Lausanne, CH;
Nagravision SA, Cheseaux-sur-Lausanne, CH;
Abstract
The aim of this invention is to propose a control method for the conformity of a network key (NK). This method is applied during the transfer of data coming from a conditional access source to a domestic network. It handles on the verification of the network key (NK) authenticity using relevant control data provided by the verification center in general in form of a list {(TK), (TK), (TK). . . }. A verification of the presence or absence of a cryptogram (TK)is carried out according to the list {(TK), (TK), (TK). . . }. The cryptogram (TK)is constituted from a test key (TK), provided by the verification center, encrypted by a network key (NK) of a security module (CT) of a device (TV, TV, PC) connected to the network.