Security document and authentication scheme
US6209923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1999 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Apr 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/206
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A security document is provided including a unique combination of covert triggers, overt triggers, and overt secure document indicators arranged to enhance the security of the document at issue. In accordance with one embodiment of the present invention, a security document is provided including a security image and a covert trigger printed on a face of the document. The security image is defined by a collection of security image elements. The security image defines at least one document authentication scheme. The document authentication scheme is arranged to provide an indication of document authenticity. The covert trigger is defined by a collection of trigger elements. The trigger elements are arranged to resemble the security image elements so the covert trigger is not readily apparent on the face of the document. In accordance with another embodiment of the present invention, a method of authenticating a security document is provided. The method includes the steps of:(i) defining an authentication constellation within the security image, wherein the authentication constellation defines a set of constellation pixels, and wherein the constellation pixels are arranged at predeter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.