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Method for sending a secure message in a telecommunications system

  • US 5,909,491 A
  • Filed: 11/06/1996
  • Issued: 06/01/1999
  • Est. Priority Date: 11/06/1996
  • Status: Expired due to Term
First Claim
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1. In a telecommunications system having at least one base station and a plurality of mobile stations, a method for sending a secure message, said method comprising the steps of:

  • assigning each mobile station a decryption key and an encryption key, wherein each encryption key is public;

    encrypting a first message at a first mobile station using the encryption key of said first mobile station to generate a second message;

    transmitting said second message from said first mobile station to said at least one base station;

    encrypting said second message at said at least one base station, using the encryption key of a second mobile station, to generate a third message;

    transmitting said third message from said at least one base station to said first mobile station;

    decrypting said third message at said first mobile station, using the decryption key of said first mobile station, to generate a fourth message;

    transmitting said fourth message from said first mobile station to said at least one base station;

    transmitting said fourth message from said at least one base station to said second mobile station; and

    decrypting said fourth message at said second mobile station using the decryption key of said second mobile station to regenerate said first message.

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