Signing and authentication devices and processes and corresponding products, notably for DVB/MPEG MHP digital streams
AssigneeThomson Licensing
InventorsRalf Schaefer, Alain Durand, Laurent Lesenne, Frédéric Pasquier
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Abstract
The present invention concerns a device and a process for signing digital streams, each of them comprising contents, related to audiovisual information, and a signaling. The device applies encrypting to selectively determined descriptors of the signaling, called authenticated descriptors, to obtain signature. The invention also concerns corresponding authentication device and process. Application to authentication of DVB/MPEG digital streams, notably for MHP.
Claims18
Device for signing digital streams for transmission via a communication network, said device producing at least one signature for incorporation in said digital streams from encrypting applied to said digital streams, each of said digital streams comprising several information entities, said entities including:
- contents, related to at least audiovisual information,
- and at least one signalling, made of an information set related to origins, destinations and structuring of said contents, said signaling being modifiable in networks due to network requirements, said signaling containing essential data structures called descriptors, and being built mainly by means of arranged groupings called tables, wherein said device can includes means for applying encrypting to at least said signaling, and more specifically to selectively determined descriptors among said descriptors of said signaling, called authenticated descriptors, that remain untouched by re-multiplexing steps in the network head-ends.
Process for signing digital streams for transmission via a communication network, by producing at least one signature to be incorporated in said digital streams from encrypting applied to said digital streams, each of said digital streams comprising several information entities, said entities including:
- contents, related to at least audiovisual information,
- and at least one signaling, made of an information set related to origins, destinations and structuring of said contents, said signaling being liable to be modified in networks due to network requirements, containing essential data structures called descriptors, and being built mainly by means of arranged groupings called tables,
- wherein said process comprises a step of applying said encrypting to said signaling, and more specifically to selectively determined descriptors among said descriptors of said signaling, called authenticated descriptors, that remain untouched by re-multiplexing steps in the network head-ends.
Device for authenticating digital streams received via a communication network by checking at least one signature incorporated in said digital streams, each of said digital streams comprising several information entities, said entities including:
- contents, related to at least audiovisual information,
- and at least one signaling, made of an information set related to origins, destinations and structuring of said contents, said signaling being liable to be modified in networks due to network requirements, containing essential data structures called descriptors, and being built mainly by means of arranged groupings called tables,
- wherein said authentication device includes means for applying authentication to at least said signaling, and more specifically to selectively determined descriptors among said descriptors of said signaling, called authenticated descriptors, from which said signature is computed, the authenticated descriptors remaining untouched by re-multiplexing steps in the network head-ends.
Dependencies are inferred from the claim text.