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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 10 — Apr. 1, 2012
  • pp: 1446–1452

Image encryption based on interference that uses fractional Fourier domain asymmetric keys

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


Applied Optics, Vol. 51, Issue 10, pp. 1446-1452 (2012)
http://dx.doi.org/10.1364/AO.51.001446


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Abstract

We propose an image encryption technique based on the interference principle and phase-truncation approach in the fractional Fourier domain. The proposed scheme offers multiple levels of security with asymmetric keys and is free from the silhouette problem. Multiple input images bonded with random phase masks are independently fractional Fourier transformed. Amplitude truncation of obtained spectrum helps generate individual and universal keys while phase truncation generates two phase-only masks analytically. For decryption, these two phase-only masks optically interfere, and this results in the phase-truncated function in the output. After using the correct random phase mask, universal key, individual key, and fractional orders, the original image is retrieved successfully. Computer simulation results with four gray-scale images validate the proposed method. To measure the effectiveness of the proposed method, we calculated the mean square error between the original and the decrypted images. In this scheme, the encryption process and decryption keys formation are complicated and should be realized digitally. For decryption, an optoelectronic scheme has been suggested.

© 2012 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.1160) Image processing : Analog optical image processing
(090.1995) Holography : Digital holography
(070.2575) Fourier optics and signal processing : Fractional Fourier transforms
(070.2615) Fourier optics and signal processing : Frequency filtering
(060.4785) Fiber optics and optical communications : Optical security and encryption

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: November 28, 2011
Revised Manuscript: January 14, 2012
Manuscript Accepted: January 14, 2012
Published: March 22, 2012

Citation
Sudheesh K. Rajput and Naveen K. Nishchal, "Image encryption based on interference that uses fractional Fourier domain asymmetric keys," Appl. Opt. 51, 1446-1452 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-10-1446


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