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Establishing a secure channel with a human user

  • US 8,220,036 B2
  • Filed: 12/12/2006
  • Issued: 07/10/2012
  • Est. Priority Date: 04/25/2002
  • Status: Expired due to Fees
First Claim
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1. A method performed by a computer system including a processor and a memory communicatively coupled to the processor, the memory storing instructions that, when executed by the processor, cause the computer system to perform the method, the method comprising:

  • rendering a first identifier to a user, the first identifier comprising a plurality of characters, wherein an offset between at least one character of the first identifier and a corresponding character of a secret identifier is negative;

    receiving an input from the user, the input indicating a plurality of offsets between the characters of the first identifier and corresponding characters of the secret identifier;

    determining, based on the input and the first identifier, whether the user demonstrates knowledge of the secret identifier; and

    authenticating or not authenticating the user based upon the outcome of said determining step.

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