Mobile radio telephone station comprising a protection system for at least one authentication number and method of protecting an authentication number
First Claim
1. A mobile radio telephone station comprising a protection system for at least one authentication number, and storage means for storing said at least one authentication number, wherein said protection system comprises encryption means for encrypting using a manufacturer key, when the radio telephone mobile station is put into operation, said at least one authentication number shown in a decrypted form, and for storing the at least one authentication number only in its encrypted form in said storage means, and for decrypting said at least one authentication number with said manufacturer key when its decrypted use is needed in the mobile radio telephone station, said manufacturer key not being transmitted by said mobile radio telephone station.
1 Assignment
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Accused Products
Abstract
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.
62 Citations
12 Claims
- 1. A mobile radio telephone station comprising a protection system for at least one authentication number, and storage means for storing said at least one authentication number, wherein said protection system comprises encryption means for encrypting using a manufacturer key, when the radio telephone mobile station is put into operation, said at least one authentication number shown in a decrypted form, and for storing the at least one authentication number only in its encrypted form in said storage means, and for decrypting said at least one authentication number with said manufacturer key when its decrypted use is needed in the mobile radio telephone station, said manufacturer key not being transmitted by said mobile radio telephone station.
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6. A wireless telephone comprising:
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a data memory; a program memory which stores a program that includes a manufacturer key; and protection means which encrypts an authentication number of said wireless telephone to form an encrypted number using said manufacturer key, said encrypted number being stored in said data memory, said protection means decrypting said encrypted number using said manufacturer key when said authentication number is needed by said wireless telephone, wherein said manufacturer key is not transmitted by said wireless telephone. - View Dependent Claims (7, 8, 9)
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10. A method of protecting an authentication key of a wireless telephone comprising:
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encrypting said authentication key using a manufacturer key included in a program memory stored in a program memory of said wireless telephone to form an encrypted key; storing said encrypted key in a data memory of said wireless telephone; and decrypting said encrypted key using said manufacturer key to form said authentication key when said authentication number is needed by said wireless telephone;
wherein said manufacturer key is not transmitted by said wireless telephone. - View Dependent Claims (11, 12)
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Specification