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US Patent 7058202 Authentication with built-in encryption by using moire intensity profiles between random layers

Patent 7058202 was granted and assigned to Ecole Polytechnique Fédérale de Lausanne (EPFL) on June, 2006 by the United States Patent and Trademark Office.

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Patent
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Patent attributes

Current Assignee
Ecole Polytechnique Fédérale de Lausanne (EPFL)
Ecole Polytechnique Fédérale de Lausanne (EPFL)
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
70582021
Patent Inventor Names
Isaac Amidror1
Date of Patent
June 6, 2006
1
Patent Application Number
101835501
Date Filed
June 28, 2002
1
Patent Primary Examiner
‌
Brian Werner
1
Patent abstract

This invention discloses new methods, security devices and apparatuses for authenticating documents and valuable articles which may be applied to any support, including transparent synthetic materials and traditional opaque materials such as paper. The invention relates to moire intensity profiles which occur in the superposition of specially designed random structures. By using specially designed random basic screen and random master screen, where at least the basic screen is comprised in the document, a moire intensity profile of a chosen shape becomes visible in their superposition, thereby allowing the authentication of the document. An important advantage of the present invention is that it can be incorporated into the standard document printing process, so that it offers high security at the same cost as standard state of the art document production. Another major advantage of the present invention is in its intrinsically incorporated encryption system due to the arbitrary choice of the random number sequences for the generation of the specially designed random dot screens that are used in this invention.

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