| 摘要 |
A method is proposed for creating a secure and authenticated channel between a multimedia processing device and a security module that can be shared between several entities, the data transmitted to one entity not compromising the other entities. The a protection method, for data exchanged between a multimedia processing device including a personal key and a security module managed by a management centre, includes determination of an identifier pertaining to an entity representing a group of multimedia processing devices, calculation of a security key formed by a one-way operation based on the personal key of the multimedia processing device and the entity identifier, and transmission of this security key to the security module connected to the entity. A security key is then formed between the multimedia processing device and the security module, by means of the reception of the entity by the multimedia processing device. The multimedia processing device then calculates the security key by a one-way operation based on the personal key of the multimedia processing device and the entity identifier. Finally, the key is used to secure the data exchanged between the multimedia processing device and the security module.
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