Abstract

We present a method for securing and encrypting information optically by use of totally incoherent illumination. Encryption is performed with a multichannel optical processor working under natural (both temporal and spatially incoherent) light. In this way, the information that is to be secured can be codified by use of color signals and self-luminous displays. The encryption key is a phase-only mask, providing high security from counterfeiting. Output encrypted information is recorded as an intensity image that can be easily stored and transmitted optically or electrically. Decryption or authentication can also be performed optically or digitally. Experimental results are presented.

© 2001 Optical Society of America

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References

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1999

1998

E. Tajahuerce, J. Lancis, V. Climent, and P. Andrés, Opt. Commun. 151, 86 (1998).
[CrossRef]

1997

J. D. Brasner and E. G. Johnson, Opt. Eng. 36, 2409 (1997).
[CrossRef]

C. L. Wilson, C. I. Watson, and E. G. Paek, Proc. SPIE 3073, 373 (1997).
[CrossRef]

1995

1994

B. Javidi and J. L. Horner, Opt. Eng. 33, 1752 (1994).
[CrossRef]

1993

1983

1981

G. M. Morris, Opt. Commun. 39, 143 (1981).
[CrossRef]

Andrés, P.

Brasner, J. D.

J. D. Brasner and E. G. Johnson, Opt. Eng. 36, 2409 (1997).
[CrossRef]

Brophy, C.

Climent, V.

Dainty, J. C.

J. C. Dainty, Laser Speckle and Related Phenomena (Springer-Verlag, Berlin, 1975).
[CrossRef]

Ding, J.

Françon, M.

M. Françon, Laser Speckle and Applications in Optics (Academic, London, 1979).

Friesem, A.

Horner, J. L.

B. Javidi and J. L. Horner, Opt. Eng. 33, 1752 (1994).
[CrossRef]

Itoh, M.

Javidi, B.

Ph. Réfrégier and B. Javidi, Opt. Lett. 20, 767 (1995).
[CrossRef]

B. Javidi and J. L. Horner, Opt. Eng. 33, 1752 (1994).
[CrossRef]

Johnson, E. G.

J. D. Brasner and E. G. Johnson, Opt. Eng. 36, 2409 (1997).
[CrossRef]

Lancis, J.

Li, H.-Y.

Lohmann, A.

Lohmann, A. W.

Mínguez-Vega, G.

Morris, G. M.

Paek, E. G.

C. L. Wilson, C. I. Watson, and E. G. Paek, Proc. SPIE 3073, 373 (1997).
[CrossRef]

Pe’er, A.

Psaltis, D.

Qiao, Y.

Réfrégier, Ph.

Stark, H.

H. Stark, Application of Optical Fourier Transforms (Academic, New York, 1982), Chap.  12.

Tajahuerce, E.

Wang, D.

Watson, C. I.

C. L. Wilson, C. I. Watson, and E. G. Paek, Proc. SPIE 3073, 373 (1997).
[CrossRef]

Wilson, C. L.

C. L. Wilson, C. I. Watson, and E. G. Paek, Proc. SPIE 3073, 373 (1997).
[CrossRef]

Yatagai, T.

Appl. Opt.

J. Opt. Soc. Am.

Opt. Commun.

G. M. Morris, Opt. Commun. 39, 143 (1981).
[CrossRef]

E. Tajahuerce, J. Lancis, V. Climent, and P. Andrés, Opt. Commun. 151, 86 (1998).
[CrossRef]

Opt. Eng.

B. Javidi and J. L. Horner, Opt. Eng. 33, 1752 (1994).
[CrossRef]

J. D. Brasner and E. G. Johnson, Opt. Eng. 36, 2409 (1997).
[CrossRef]

Opt. Lett.

Proc. SPIE

C. L. Wilson, C. I. Watson, and E. G. Paek, Proc. SPIE 3073, 373 (1997).
[CrossRef]

Other

H. Stark, Application of Optical Fourier Transforms (Academic, New York, 1982), Chap.  12.

M. Françon, Laser Speckle and Applications in Optics (Academic, London, 1979).

J. C. Dainty, Laser Speckle and Related Phenomena (Springer-Verlag, Berlin, 1975).
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

Dispersion-compensated processor for optical encryption with incoherent light.

Fig. 2
Fig. 2

Optical encryption experiment with totally incoherent light. (a) gray-level picture of the input object as imaged by the optical processor in Fig.  1 without the aperture filter, (b) gray-level picture of the PSF associated with the system in Fig.  1, with the random phase filter at the aperture plane.

Fig. 3
Fig. 3

Gray-level pictures of the irradiance: (a) an encrypted image of the input in Fig.  2(a) provided by the system in Fig.  1 and (b) the result of the decryption.

Equations (3)

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IFx,y=IOxMo,yMo;λ*p˜xβλ,yβλ;λ2Sλdλ,
px,y;λ=Ax,yexpj2πλn-1hx,y,
IEx,y=IOxMo,yMo;λSλdλ*p˜Exβ0,yβ02,

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