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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 22 — Aug. 1, 2012
  • pp: 5377–5386

Asymmetric color cryptosystem using polarization selective diffractive optical element and structured phase mask

Sudheesh K. Rajput and Naveen K. Nishchal  »View Author Affiliations


Applied Optics, Vol. 51, Issue 22, pp. 5377-5386 (2012)
http://dx.doi.org/10.1364/AO.51.005377


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Abstract

A single channel asymmetric color image encryption scheme is proposed that uses an amplitude- and phase- truncation approach with interference of polarized wavefronts. Instead of commonly used random phase masks, wavelength-dependent structured phase masks (SPM) are used in the fractional Fourier transform domain for image encoding. The primary color components bonded with different SPMs are combined into one grayscale image using convolution. We then apply the amplitude and phase truncation to the fractional spectrum, which helps generate unique decryption keys. The encrypted image bonded with a different SPM is then encoded into a polarization selective diffractive optical element. The proposed scheme alleviates the alignment problem of interference and does not need iterative encoding and offers multiple levels of security. The effect of a special attack to the proposed asymmetric cryptosystem has been studied. To measure the effectiveness of the proposed method, we calculated the mean square error between the original and the decrypted images. The computer simulation results support the proposed idea.

© 2012 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(070.2575) Fourier optics and signal processing : Fractional Fourier transforms

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: April 16, 2012
Revised Manuscript: June 22, 2012
Manuscript Accepted: June 22, 2012
Published: July 24, 2012

Citation
Sudheesh K. Rajput and Naveen K. Nishchal, "Asymmetric color cryptosystem using polarization selective diffractive optical element and structured phase mask," Appl. Opt. 51, 5377-5386 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-22-5377


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