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Method and device for checking an identifier

  • US 10,063,370 B2
  • Filed: 09/11/2014
  • Issued: 08/28/2018
  • Est. Priority Date: 09/11/2014
  • Status: Active Grant
First Claim
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1. A method for processing data in a security processor comprising:

  • receiving, at the security processor, input data and a first identifier from a master processor;

    calculating a second identifier based on the input data using the security processor;

    conducting a first operation comparing the second identifier with the first identifier using the security processor;

    receiving, at the security processor, a modified first identifier from the master processor, wherein the modified first identifier is obtained via at least one logical operation applied on the first identifier using the master processor, and wherein the modified first identifier is different from the first identifier;

    conducting a second operation comparing the second identifier with the modified first identifier using the security processor; and

    providing, using the security processor, a result of the first operation and a result of the second operation to the master processor;

    wherein the first identifier is verified successfully when the first identifier matches the second identifier and the first operation and the second operation provide different results; and

    wherein the first identifier is not verified successfully when the first operation and the second operation provide the same results.

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