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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 4 — Feb. 1, 2013
  • pp: 871–878

Known-plaintext attack-based optical cryptosystem using phase-truncated Fresnel transform

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

Applied Optics, Vol. 52, Issue 4, pp. 871-878 (2013)

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In this paper, we propose a scheme for information security under the basic double random phase encoding framework but with enhanced complexity and immunity against the known-plaintext attack. Modified Gerchberg–Saxton algorithm is used to convert a primary image into a phase-only mask (POM). The POM is used as a Fresnel domain key for encrypting an arbitrary data, called random intensity mask (RIM) bonded with a random phase mask. With phase- and amplitude-truncation, asymmetric keys are generated from the RIM. For decryption, the main target is to get the POM, for which the concept of known-plaintext attack has been used. The conventional schemes for attack use known-plaintext for key generation, but in this study it refers to the asymmetric keys. Obtaining Fresnel transform with the same parameters of the POM gives the primary image. We present the computer simulation results of multiple gray-scale images without any cross talk and also for a color image. The decryption is simple and straightforward and can be done digitally or optically. An optical setup for decryption has been suggested.

© 2013 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.2000) Image processing : Digital image processing
(100.5070) Image processing : Phase retrieval
(060.4785) Fiber optics and optical communications : Optical security and encryption

ToC Category:
Image Processing

Original Manuscript: October 22, 2012
Revised Manuscript: January 3, 2013
Manuscript Accepted: January 3, 2013
Published: February 1, 2013

Sudheesh K. Rajput and Naveen K. Nishchal, "Known-plaintext attack-based optical cryptosystem using phase-truncated Fresnel transform," Appl. Opt. 52, 871-878 (2013)

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