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  • US 10,354,060 B2
  • Filed: 09/03/2015
  • Issued: 07/16/2019
  • Est. Priority Date: 09/03/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a first access request from a client computer;

    in response to receiving the first access request;

    generating an image comprising a predetermined number of characters;

    transmitting the image to the client computer for display to a user;

    designating, via a unique indicator, a first subset of the predetermined number of characters of the image, wherein the first subset comprises a plurality of the predetermined number of characters and wherein a second subset of the predetermined number of characters of the image are not designated via the unique identifier, the second subset being different than the first subset;

    requesting from the user a first predefined response comprising the first subset of the predetermined number of characters and excluding the second subset of the predetermined number of characters;

    wherein the first predefined response comprises fewer than all of the predetermined number of characters, includes particular ones of the predetermined number of characters and excludes all of the predetermined number of characters other than the particular ones;

    receiving a first client input from the client computer;

    determining whether the first client input matches the first predefined response; and

    accepting the first access request if the first client input matches the first predefined response.

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