Method and device for guaranteeing the integrity and...

H - Electricity – 04 – L

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H04L 9/32 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2381089

In order to guarantee the integrity and the authenticity of the data transmitted into a control center and one or more receiver units, each receiver unit includes a decoder (IRD) and a security unit (SC) and also a means of communication (NET, REC) with the control center. The method consists of calculating a check information (Hx) representative of the result of a so-called mono-directional and collision-free function, carried out on all or only a part of the data transmitted and to transmit the result to the control center for verification. The center may inform the decoder on the authenticity of the data along the return paths or the main path.

Afin de garantir l'intégrité et l'authenticité des données transmises entre un centre de gestion et une ou plusieurs unités réceptrices, chaque unité réceptrice comprend un décodeur (IRD) et une unité de sécurité (SC) ainsi que des moyens de communications (NET, REC) avec le centre de gestion. La méthode consiste à calculer une information de contrôle (Hx) représentative du résultat d'une fonction dite unidirectionnelle et sans collision, effectuée sur tout ou partie de données transmises et de transmettre le résultat au centre de gestion pour vérification. Le centre pourra informer le décodeur de l'authenticité des données par les voies de retour ou par la voie principale.

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