Tamper-indicating barcode and method
First Claim
1. A tamper-indicating barcode comprising a barcode component having at least one tamper-indicating means attached thereto, wherein the barcode component is a pixel-based spread-spectrum barcode and the tamper-indicating means has pre-determined characteristics, and further wherein user data is modulated in a distributed fashion across a data bearing barcode image so that each pixel of image, on average, contains an equal fraction of all the encoded information.
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Accused Products
Abstract
A novel tamper-indicating barcode methodology is disclosed that allows for detection of alteration to the barcode. The tamper-indicating methodology makes use of a tamper-indicating means that may be comprised of a particulate indicator, an optical indicator, a deformable substrate, and/or may be an integrated aspect of the barcode itself. This tamper-indicating information provides greater security for the contents of containers sealed with the tamper-indicating barcodes.
62 Citations
28 Claims
- 1. A tamper-indicating barcode comprising a barcode component having at least one tamper-indicating means attached thereto, wherein the barcode component is a pixel-based spread-spectrum barcode and the tamper-indicating means has pre-determined characteristics, and further wherein user data is modulated in a distributed fashion across a data bearing barcode image so that each pixel of image, on average, contains an equal fraction of all the encoded information.
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24. A method for ascertaining if a pixel-based spread-spectrum barcode has been tampered with comprising the steps of:
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a. providing a tamper-indicating barcode comprising a pixel-based barcode component having at least one tamper-indicating means attached thereto, wherein the tamper-indicating means has pre-determined characteristics, and wherein user data is modulated in a distributed fashion across a data bearing barcode image so that each pixel of image, on average, contains an equal fraction of all the encoded information;
b. examining the barcode to determine the current characteristics of the tamper-indicating means; and
c. comparing the current characteristics with the reference characteristics to ascertain if the barcode has been tampered with. - View Dependent Claims (25, 26, 27, 28)
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Specification