摘要 |
The mobile station comprises Traffic Identification Encryption means (TIE) and a memory (54) for storing at least one authentication number (A-key). According to the invention, the protection system comprises a program (61) for encrypting during operation the A-key by the TIE means, and for storing (A1) the encrypted A key, and a program (62) for decrypting, according to the TIE means, the A-key when its non-coded use is needed in the mobile station.
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