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Authenticator, authenticatee and authentication method

  • US 9,887,841 B2
  • Filed: 11/12/2015
  • Issued: 02/06/2018
  • Est. Priority Date: 08/31/2011
  • Status: Active Grant
First Claim
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1. A host device capable of performing an authentication process with a memory device which includes card key data hidden in the memory device and unique to the memory device, the host device comprising:

  • a decryptor;

    a selector;

    a hardware processor; and

    a comparator,wherein the host device is configured to;

    receive first data from the memory device;

    generate, second data by the decryptor decrypting the received first data using third key data hidden in the host device;

    receive key index data from the memory device;

    select, by the selector, first key data based on the received key index data, the first key data pre-stored and hidden in the host device, wherein the first key data is derived from the card key data and the card key data is capable of being generated from the first key data, and wherein the third key data is independent of the card key data and the card key data is incapable of being generated from the third key data;

    transmit first information data and random number data to the memory device, the first information data pre-stored in the host device;

    generate, by the processor, second key data based on the selected first key data and the random number data;

    generate, by the processor, third data based on the generated second key data and the second data;

    receive fourth data from the memory device; and

    compare, by the comparator, the generated third data with received fourth data.

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