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Electronic signing methods, systems, and apparatus

  • US 9,495,546 B2
  • Filed: 12/18/2014
  • Issued: 11/15/2016
  • Est. Priority Date: 12/31/2013
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a communication interface configured to physically locally connect the apparatus to a host computer; and

    a data processing component adapted to provide a cryptographic processing result generated by cryptographically combining a cryptographic secret key with first input data;

    wherebythe apparatus is adapted to present itself to said host computer, when it is connected to said host computer by the communication interface, as a mass storage device that an application on the host computer can access through a standard mass storage access mechanism for exchanging files;

    the apparatus is adapted to generate an output file and the communication interface is adapted to return the output file to said host computer over said communication interface whereby said output file comprises the cryptographic processing result, and said host computer obtains said output file by reading said output file from the apparatus over said communication interface through a mechanism for reading files of said standard mass storage access mechanism; and

    the apparatus is further adapted to generate a one-time password whereby said one-time password is comprised in said result of said cryptographically combining of said cryptographic secret key with said first input data and whereby said first input data comprises a dynamic variable; and

    (1) whereby the apparatus further comprises a clock and said dynamic variable is based on a time value provided by the clock;

    or(2) whereby the apparatus further comprises a first memory component to store a second variable and the apparatus is further adapted to determine a value of said dynamic variable as a function of said stored second variable and to update and store the value of the second variable when the value of the second variable has been used for said combining.

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