Fourier Optics and Optical Signal Processing

Optical cryptographic system employing multiple reference-based joint transform correlation technique

[+] Author Affiliations
Mohammed Nazrul Islam

State University of New York, Department of Security Systems, Farmingdale, New York 11735

Mohammad Ataul Karim

Old Dominion University, Office of Research, Norfolk, Virginia 23529

Mohammad Showkat Alam

University of South Alabama, Department of Electrical and Computer Engineering, Mobile, Alabama 36688

K. Vijayan Asari

University of Dayton, Department of Electrical and Computer Engineering, Dayton, Ohio 45469

Opt. Eng. 50(6), 068202 (June 16, 2011). doi:10.1117/1.3591120
History: Received November 12, 2010; Revised April 15, 2011; Accepted April 22, 2011; Published June 16, 2011; Online June 16, 2011
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An optical joint transform correlation-based cryptographic system is a used to feed multiple phase-shifted encryption keys into four parallel channels along with a to-be-encrypted signal in the form of an image. The resulting joint power spectra (JPS) signals are phase-shifted and then combined to yield a modified JPS signal. Inverse Fourier transformation of the modified JPS signal yields the secured encrypted image. For decryption purpose, the received encrypted signal is first Fourier transformed and multiplied by the encryption key used in encryption. The derived signal is then inverse Fourier transformed to generate the output signal. The proposed system offers a nonlinear encryption without the involvement of any complex mathematical operation on the encryption key otherwise required in similar encryption techniques and is invariant to noise. Computer simulation results are presented to show the effectiveness of the proposed scheme with binary, as well as gray images in both noise-free and noisy environment.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Mohammed Nazrul Islam ; Mohammad Ataul Karim ; Mohammad Showkat Alam and K. Vijayan Asari
"Optical cryptographic system employing multiple reference-based joint transform correlation technique", Opt. Eng. 50(6), 068202 (June 16, 2011). ; http://dx.doi.org/10.1117/1.3591120


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