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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5257–5262

Cryptanalysis of optical security systems with significant output images

Guohai Situ, Unnikrishnan Gopinathan, David S. Monaghan, and John T. Sheridan  »View Author Affiliations


Applied Optics, Vol. 46, Issue 22, pp. 5257-5262 (2007)
http://dx.doi.org/10.1364/AO.46.005257


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Abstract

The security of the encryption and verification techniques with significant output images is examined by a known-plaintext attack. We introduce an iterative phase-retrieval algorithm based on multiple intensity measurements to heuristically estimate the phase key in the Fourier domain by several plaintext-cyphertext pairs. We obtain correlation output images with very low error by correlating the estimated key with corresponding random phase masks. Our studies show that the convergence behavior of this algorithm sensitively depends on the starting point. We also demonstrate that this algorithm can be used to attack the double random phase encoding technique.

© 2007 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4560) Fourier optics and signal processing : Data processing by optical means
(100.5070) Image processing : Phase retrieval
(200.4560) Optics in computing : Optical data processing

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: January 2, 2007
Manuscript Accepted: April 14, 2007
Published: July 9, 2007

Citation
Guohai Situ, Unnikrishnan Gopinathan, David S. Monaghan, and John T. Sheridan, "Cryptanalysis of optical security systems with significant output images," Appl. Opt. 46, 5257-5262 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-22-5257

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