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Security system and method

  • US 9,407,445 B2
  • Filed: 12/30/2014
  • Issued: 08/02/2016
  • Est. Priority Date: 12/09/2003
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • storing, in a first register of a first Radio Frequency Identification (RFID) device, a secret code associated with a second RFID device;

    generating, at the first RFID device, a first random number;

    storing, in a second register of the first RFID device, the first random number;

    storing, in the second register of the first RFID device, a second random number generated at the second RFID device;

    receiving output from the first and second registers;

    applying an exclusive OR (XOR) application to the output from the first register and the output from the second register to generate a random number sequence for data encryption;

    feeding the random number sequence into the second register of the first RFID device in a subsequent cycle, wherein a plurality of cycles are executed prior to transmission of data to the second RFID device; and

    transmitting a packet of data from the first RFID device to the second RFID device, the packet of data comprising a command and an encrypted payload, wherein at least a portion of the command is unencrypted,wherein the command is configured to instruct the second RFID device to perform a function,wherein the function is selected from the group consisting of;

    read;

    write;

    acknowledge;

    select;

    send; and

    combinations thereof.

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