Method for securing a system protected by key hierarchy

H - Electricity – 04 – L

Patent

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Details

H04L 9/08 (2006.01) H04L 9/14 (2006.01) H04N 7/167 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2310406

The invention relates to a method for securing at least one system protected by a predetermined hierarchy of cryptographic keys, more particularly a Pay-TV system, against unauthorized users. Current key hierarchy systems do not enable detection of unreliable clients who make copies of a group key transmitted by a system provider and pass them on to other persons. According to the invention, this is solved by detecting at least one individual cryptographic key assigned to an unreliable user by forming the intersection of at least two predetermined subsets formed at different times and belonging to the same hierarchy.

L'invention concerne un procédé pour sécuriser au moins un système protégé par une hiérarchie prédéfinie de clés de chiffrement, notamment un système de télévision à péage, contre un usage illicite. Les systèmes de hiérarchie cryptographique actuels ne permettent pas la détection d'un usager douteux qui contrefait une clé de groupe transmise par l'exploitant d'un système et la divulgue à des tierces personnes. La solution proposée par l'invention consiste à détecter au moins une clé de chiffrement individuelle attribuée à un usager douteux, en formant l'intersection d'au moins deux sous-ensembles prédéterminés constitués à différents moments et appartenant au même niveau hiérarchique.

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