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Data security method and system

  • US 8,621,223 B2
  • Filed: 06/30/2008
  • Issued: 12/31/2013
  • Est. Priority Date: 06/30/2008
  • Status: Active Grant
First Claim
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1. A method of verifying integrity of a digital file comprising:

  • labeling, in a first network, the digital file prior to exposure to a foreign environment, the first network having a first security classification level, wherein labeling comprises;

    creating a header label comprising an identification of the first security classification level;

    appending the header label to the digital file;

    hashing the digital file, together with the appended header label, to obtain a first hash value;

    signing the first hash value to create a digital signature;

    creating a signature label comprising one or both of the first hash value and the digital signature; and

    appending the signature label to the digital file; and

    validating, in a second network, the digital file subsequent to exposure to the foreign environment, the second network having a second security classification level that is different from the first security classification level, wherein validating comprises;

    hashing the digital file to obtain a second hash value;

    retrieving the first hash value from the signature label;

    comparing the first hash value and second hash value; and

    removing the signature label from the digital file.

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