US 12,468,914 B2
Method and device for securing a document and method and device for authenticating a document, document secured using such a method
Zbigniew Sagan, Rueil-Malmaison (FR); and Jean-Pierre Massicot, Rueil-Malmaison (FR)
Appl. No. 18/250,756
Filed by ADVANCED TRACK & TRACE, Rueil-Malmaison (FR)
PCT Filed Nov. 17, 2021, PCT No. PCT/EP2021/082020
§ 371(c)(1), (2) Date Apr. 27, 2023,
PCT Pub. No. WO2022/106484, PCT Pub. Date May 27, 2022.
Claims priority of application No. FR2011779 (FR), filed on Nov. 17, 2020.
Prior Publication US 2023/0394267 A1, Dec. 7, 2023
Int. Cl. G06K 19/06 (2006.01)
CPC G06K 19/06056 (2013.01) [G06K 19/06037 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A Method for securing a document, comprising:
a step of statistically determining the average amplitude of an unpredictable print variation, dot by dot, of at least one geometric characteristic among the dimensions, shape and/or position of the dot;
a step of generating a message representative of at least one predefined print variation rate;
a step of encoding the message generated in a 2D barcode comprising a plurality of cells, at least one cell comprising at least one set of two areas, each area comprising a plurality of dots, a set comprising:
a first area including dots representing a symbol, and
a second area, different from the first area, including a matrix of dots, wherein said matrix of dots has dimensions smaller than the dimensions of the second area and having at least one geometric characteristic, among the dimensions, shape and/or position, of the order of magnitude of the average amplitude of the statistically determined unpredictable print variation; and
a step of printing the document with the barcode, this printing, as a result of unanticipated unknowns in printing, causing an unpredictable variation, dot by dot, of at least one geometric characteristic of the printed dots among the dimensions, shape and/or position, the printed 2D barcode therefore representing two variations, one generated and the other unpredictable dot by dot.