Data transmission method between a broadcasting center and a multimedia unit
First Claim
1. Data transmission method between a diffusion centre and a multimedia unit, the latter comprising at least one unique key and a security module (MS) having a transport key, this method comprising the following steps:
- generation of a session key by a management centre, transmission of the session key to the diffusion centre, encryption of the session key by the unique key of the multimedia unit, transmission of a management message encrypted by the transport key comprising the encrypted session key to the multimedia unit, transmission of the management message to the security module by means of the multimedia unit, decryption of the management message by the transport key of the security module and transmission of the encrypted session key to the multimedia unit, decryption of the session key encrypted by the unique key of the multimedia unit, creation of a secure connection by the encryption and decryption, by the session key, of data exchanged between the diffusion centre and the multimedia unit.
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Accused Products
Abstract
The aim of this invention is to propose a flexible solution to the risk represented by access to a temporary memory of a specialized decryption/decompression circuit for a Pay-TV decoder. This aim is achieved by a data transmission method between a diffusion centre and a multimedia unit, the latter comprising at least one unique key and a security module having a transport key, this method comprising the following stages: generation of a session key by a management centre, transmission of the session key to the diffusion centre, encryption of the session key by the unique key of the multimedia unit, transmission of a message encrypted by the transport key comprising the encrypted session key to the multimedia unit, transmission of the message to the security module by the multimedia unit, decryption of the message by the transport key of the security module and transmission of the encrypted session key to the multimedia unit, decryption of the session key encrypted by the unique key of the multimedia unit, creation of a connection secured by the encryption and decryption, by the session key, of data exchanged between the diffusion centre and the multimedia unit.
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Citations
6 Claims
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1. Data transmission method between a diffusion centre and a multimedia unit, the latter comprising at least one unique key and a security module (MS) having a transport key, this method comprising the following steps:
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generation of a session key by a management centre, transmission of the session key to the diffusion centre, encryption of the session key by the unique key of the multimedia unit, transmission of a management message encrypted by the transport key comprising the encrypted session key to the multimedia unit, transmission of the management message to the security module by means of the multimedia unit, decryption of the management message by the transport key of the security module and transmission of the encrypted session key to the multimedia unit, decryption of the session key encrypted by the unique key of the multimedia unit, creation of a secure connection by the encryption and decryption, by the session key, of data exchanged between the diffusion centre and the multimedia unit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification