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Dynamic challenge-response authentication and verification of identity of party sending or receiving electronic communication

  • US 6,343,361 B1
  • Filed: 11/13/1998
  • Issued: 01/29/2002
  • Est. Priority Date: 11/13/1998
  • Status: Expired due to Term
First Claim
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1. A method for securely transmitting information between a first device and a second device, comprising the steps of:

  • storing a primary key at the first device and at the second device;

    encrypting a selected string of characters to generate a secondary key using the primary key at the first device;

    transmitting the secondary key from the first device to the second device;

    selecting, by a user of the first device, a subset of the characters in the selected string of characters;

    entering, by the user, an input code to the first device, the input code representing the selected subset of characters;

    reproducing the selected string of characters at the second device by applying the primary key to the secondary key; and

    transmitting the input code from the first device to the second device.

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