| 摘要 |
The objective of the present invention is to propose a method that guarantees the encryption of the exchanged data a security module and a user unit by a pairing key specific to the couple user unit/security module, and at the same time leaving the possibility for the security module to be paired with other user units. According to the invention, this objective is achieved by a method consisting in: detecting by the user unit if the connected security module is paired with it, if it is so, using a unique pairing key specific to the couple user unit/security module to encrypt the exchanged data, if it is not so, requesting the operating centre the authorisation to pair with this security module, a request accompanied by the identifications of the user unit and the security module, verifying by the operating centre the conformity of this pairing request and transmitting the result to the user unit, if the authorisation is given, establishing a pairing key unique to the couple user unit/security module to encrypt the exchanged data.
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