Method and system for transmission of decrypting information

Details Method and system for transmission of decrypting information Method and system for transmission of decrypting information

H - Electricity

04

N

H04N 21/2347 (2011.01) H04L 9/14 (2006.01)

Patent

CA 2397211

At the moment of the diffusion of Pay-TV with multi-channel signals, each channel is associated to authorization messages (ECM) which allow to decrypt this channel according to the rights of the subscriber. When changing channel, a very short time is accepted before one has determined these new rights in relation with the new channel. The heavy encrypting algorithms are thus excluded. To avoid this drawback, to decrypt a channel, a system is proposed using the combination of the authorization information for a channel (ECM), and thus encrypted by a fast algorithm, with authorization information (MECM) for a group of channels. These latter are encrypted by a high security algorithm and are thus slower to decrypt.

Lors de la diffusion télévisuelle payante par des signaux multi-canaux, chaque canal est associé à des messages d'autorisation (ECM) qui permettent de décoder ce canal conformément aux droits de l'abonné. Lors d'un changement de canal, un laps de temps très court est accepté avant que les nouveaux droits aient été déterminés par rapport au nouveau canal. Les algorithmes de codage complexes sont ainsi exclus. Pour éviter cet inconvénient et coder un canal, l'invention concerne un système qui utilise l'association des informations d'autorisation relative à un canal (ECM), par conséquent codé par un algorithme rapide, et des informations d'autorisation (MECM) relative à un groupe de canaux. Ce dernier est codé par un algorithme de haute sécurité et est donc plus long à décoder.

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