Authentication with built-in encryption by using moire...

Image analysis – Applications

Reexamination Certificate

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C380S044000, C283S093000

Reexamination Certificate

active

07058202

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.

REFERENCES:
patent: 5018767 (1991-05-01), Wicker
patent: 5025285 (1991-06-01), Schwarz
patent: 5275870 (1994-01-01), Halope et al.
patent: 5396559 (1995-03-01), McGrew
patent: 5613013 (1997-03-01), Schuette
patent: 5712731 (1998-01-01), Drinkwater et al.
patent: 5830548 (1998-11-01), Andersen et al.
patent: 5995638 (1999-11-01), Amidror et al.
patent: 6045477 (2000-04-01), Schmidt
patent: 6198545 (2001-03-01), Ostromoukhov et al.
patent: 6249588 (2001-06-01), Amidror et al.
patent: 6423478 (2002-07-01), Ha
patent: 6532082 (2003-03-01), Dewitte
patent: 1138011 (1968-12-01), None
patent: 2224240 (1990-05-01), None
U.S. Appl. No. 09/902,445, filed Jul. 11, 2001, Amidrov et al.
U.S. Appl. No. 09/477,544, filed Jan. 4, 2000, Ostromoukhov et al.
Glass patterns revisited: a unified approach for the explanation of stochastic and periodic moires, by I. Amidror. Submitted to the Journal of the Opt. Soc. of America A, 2002.
Fourier-based analysis and synthesis of moires in the superposition of geometrically transformed periodic structures, by I. Amidror and R.D. Hersch; Journal of the Optical Society of America A, vol. 15, 1998; pp. 1100-1113.
The Theory of the Moire Phenomenon, by I. Amidror, Kluwer Academic Publishers, 2000.
A Generalized Fourier-Based Method for the Analysis of 2D Moire Envelope-Forms in Screen Superpositions, by I. Amidror; Journal of Modern Optics, vol. 41, No. 9, 1994; pp. 1837-1862.
Microlens arrays, by M. Hutley et al.; Physics World, Jul. 1991; pp. 27-32.
New imaging functions of moire by fly's eye lenses, by O. Mikami; Japan Journal of Applied Physics, vol. 14, No. 3, 1975; pp. 417-418.
New image-rotation using moire lenses, by o. Mikami; Japan Journal of Applied Physics, vol. 14, No. 7, 1975; pp. 1065-1066.
Artistic screening, by V. Ostromoukhov and R.D. Hersch; SIGGRAPH Annual Conference, 1995, pp. 219-228.
Multi-color and artistic dithering, by V. Ostromoukhov and R. D. Hersch; SIGGRAPH Annual Conference, 1999, pp. 425-432.
Application of laser technology to introduce security features on security documents in order to reduce counterfeiting, by W. Hospel; SPIE vol. 3314, 1998, pp. 254-259.
Halftone patterns for arbitrary screen periodicities, by T.S. Rao and G.R. Arce; Journal of the Opt. Soc. of America A, vol. 5, 1988, pp. 1502-1511.
Halftone images: spatial resolution and tone reproduction, by O. Bryngdahl; Journal of the the Opt. Soc. of America, vol. 68, 1978, pp. 416-422.
Moire effect from random dots, by L. Glass; Nature, vol. 223, Aug. 1969, pp. 578-580.
Perception of random dot interference patterns, by L. Glass and R. Pérez; Nature, vol. 246, Dec. 1973, pp. 360-362.
CRC Concise Encyclopedia of Mathematics, by E. W. Weisstein, CRC, Boca Raton, 1999, pp. 176, 653.
J. W. Wesner, “Screen patterns used in reproduction of continous-tone graphics”, Applied Optics, vol. 13, 1974, pp. 1703-1710.
J. Walker, “The amateur scientist: Visual illusions in random-dot patterns and television ‘snow’”, Scientific American, vol. 242, 1980, pp. 136-140.
J. Walker, “The amateur scientist: More about random-dot displays plus computer programs to generate them”, Scientific American, vol. 243, 1980, pp. 158-159, 163-168.
H. Kipphan, Handbook of Print Media. Springer, Berlin, 2001, pp. 92-99.
M. Rodriguez, “Promises and pitfalls of stochastic screening in the graphic arts industry”, Proceedings of te IS&T 47th annual conference, Rochester, NY, 1994.

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