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Authentication Method and Token Using Screen Light for Both Communication and Powering

  • US 20100088754A1
  • Filed: 12/12/2007
  • Published: 04/08/2010
  • Est. Priority Date: 03/07/2007
  • Status: Abandoned Application
First Claim
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1. A contactless method to optically transfer server'"'"'s requests to an authentication token, while at the same time supplying it with power, by means of the light emitted by portions of the screen, or monitor, displaying said server'"'"'s login page;

  • characterised in that said method is arranged forsending a code by the server by means of a time sequence of a bright image alternating with a dark image, said time sequence encoding said code as variations in the corresponding screen light output;

    using an array of solar cells in the authentication token to convert said variations of the screen light output into a corresponding varying electric signal;

    decoding the varying electric signal to obtain an input code;

    using a Microprocessor Unit, MPU, which also includes a non volatile memory, to obtain a One Time Password, OTP, by applying an encryption method or by applying an OTP generation method using the obtained input code;

    displaying said One Time Password on a suitable display device of the authentication token, so as to allow the user to enter it on the server'"'"'s login page;

    whereby the encoding time sequence of images is purposely arranged so as to guarantee that the corresponding light output is sufficient to generate, after its conversion by said array of solar cells, all the energy needed by the MPU for carrying out the required tasks.

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