Importance

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Abstract

A mobile communication terminal authenticating system for renewing an authenticating key without transmitting the authenticating key between the mobile communication terminal and the mobile communication network is provided. In the mobile communication terminal 1, a calculating circuit 1c executes a calculation F on the basis of a random number generated by a PN (Pseudo Noise) oscillator 3a of a switching center 3 and an authenticating key held by a memory 1b, and its calculating result is transmitted to the switching center 3. In the switching center 3, a comparator 3c compares its calculating result with a result of the calculation F executed on the basis of the random number and the authenticating key received from the home location register 4 by a calculating circuit 3b. If the two calculating results coincide with each other, the authenticating key renewal instruction is transmitted from the control circuit 3d to the mobile communication terminal 1. In the mobile communication terminal 1, a calculating circuit 1d executes a calculation G on the basis of the random number and the authenticating key, and its calculating result is stored in the memory 1b as a new authenticating key. Likewise, the calculating circuit 3e of the switching center 3 executes the calculation G so that the authenticating key of the home location register 4 is renewed.

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First Claim