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Authentication method for mobile communications

  • US 5,596,641 A
  • Filed: 03/14/1995
  • Issued: 01/21/1997
  • Est. Priority Date: 03/17/1994
  • Status: Expired due to Term
First Claim
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1. A mobile communication authentication method for authenticating a mobile station which accesses for roaming a network different from a home network of the mobile station, said mobile station and said home network having the same secret key and using the same cipher function, said method comprising the steps of:

  • preliminarily authenticating said mobile station by sending from said home network to said roamed network, a plurality of pairs of first random numbers and calculation results of the cipher function, said calculation being performed at said home network using said secret key and said first random numbers, sending, from said roamed network to said mobile station, third random numbers formed by coupling second random numbers produced at said roamed network with said first random numbers, sending, from said mobile station to said roamed network, calculation results of the cipher function, said calculation being performed at said mobile station using said secret key and said sent third random numbers, and confirming, at said roamed network, coincidence of the calculation results sent from said mobile station with the calculation results sent from said home network; and

    authenticating said mobile station by using a pair of said second random number and of said calculation result with respect to the second random number, sent from said mobile station.

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