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Fraud detection and user validation system for mobile earth terminal communication device

  • US 5,748,742 A
  • Filed: 11/30/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 11/30/1995
  • Status: Expired due to Fees
First Claim
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1. In a mobile satellite system including a satellite communication switching office having a satellite antenna for receiving/transmitting a satellite message via a satellite from/to a vehicle using a mobile communication system, a satellite interface system, a central controller receiving/transmitting the satellite message from/to the satellite communication switching office issued from the vehicle via the satellite and the satellite interface system, a method of preventing a mobile communication system from fraudulently commissioning in the satellite communication system, said method comprising the steps of:

  • (a) requesting, by a user, to become a subscriber in a communication system;

    (b) generating a first input signal by the mobile communication system;

    (c) transmitting the first input signal from the mobile communication system to the central controller;

    (d) generating a first security key having a first component in the central controller using a data encryption algorithm, the data encryption algorithm using the first input signal and a second input signal generated by a random number generator in the central controller;

    (e) generating a third input signal responsive to the first input signal confirming receipt of the first input signal by the central controller;

    (f) transmitting the third input signal from the central controller to the mobile communication system responsive to said transmitting step (c);

    (g) generating a second security key having a second component in the mobile communication system using the data encryption algorithm, the data encryption algorithm using the first input signal and the second input signal independently generated in the mobile communication system; and

    (h) verifying by the central controller when the mobile communication system initiates a communication that the mobile communication system is commissioned as a valid subscriber to be eligible for subsequent authentication in the communication system responsive to a comparison of the first component of the first security key with the second component of the second security key.

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