Method and circuit for encrypting a data stream

Details Method and circuit for encrypting a data stream Method and circuit for encrypting a data stream

G - Physics

11

B

G11B 20/00 (2006.01)

Patent

CA 2557014

Current legislation requires the possibility of encryption when storing television programmes received by broadcast. However, legacy playback apparatuses will not be able to play back such encrypted data in a regular way, but possibly in a wrong way. This may result in problems like damage of speakers. Therefore, the application intends to hide any of such possibly damaging streams by intentionally providing such streams with a wrong identification during the encryption process. The application provides among others a method and circuit for encryption and a method and circuit for decryption. The application is especially suitable for DVD recorders, but may also be employed for other video and/or audio recorders. The invention may even be used for encrypting non-audiovisual data.

La législation actuelle demande la possibilité de cryptage lors du stockage de programmes télévisés reçus par diffusion. Cependant, les appareils de lecture autorisés ne sont pas aptes à lire de telles données cryptées de manière régulière, il y a des risques qu'ils le fassent de manière erronée. Ceci se traduit par des problèmes de type dommages aux haut-parleurs. Par conséquent, l'invention vise à masquer tous flots d'endommagement par l'apport intentionnel de flots ayant une identification erronée pendant le procédé de cryptage. On prévoit entre autre un procédé et un circuit de cryptage et un procédé et un circuit de décryptage. L'invention porte essentiellement sur des enregistreurs DVD, mais peut être utilisée sur d'autres enregistreurs vidéo et/ou audio. L'invention peut même être utilisée pour le cryptage de données non audiovisuelles.

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