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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 26 — Sep. 10, 2007
  • pp: 6641–6647

Key-space analysis of double random phase encryption technique

David S. Monaghan, Unnikrishnan Gopinathan, Thomas J. Naughton, and John T. Sheridan  »View Author Affiliations


Applied Optics, Vol. 46, Issue 26, pp. 6641-6647 (2007)
http://dx.doi.org/10.1364/AO.46.006641


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Abstract

We perform a numerical analysis on the double random phase encryption∕decryption technique. The key-space of an encryption technique is the set of possible keys that can be used to encode data using that technique. In the case of a strong encryption scheme, many keys must be tried in any brute-force attack on that technique. Traditionally, designers of optical image encryption systems demonstrate only how a small number of arbitrary keys cannot decrypt a chosen encrypted image in their system. However, this type of demonstration does not discuss the properties of the key-space nor refute the feasibility of an efficient brute-force attack. To clarify these issues we present a key-space analysis of the technique. For a range of problem instances we plot the distribution of decryption errors in the key-space indicating the lack of feasibility of a simple brute-force attack.

© 2007 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.2000) Image processing : Digital image processing
(200.4740) Optics in computing : Optical processing

ToC Category:
Optics in Computing

History
Original Manuscript: November 20, 2006
Revised Manuscript: May 2, 2007
Manuscript Accepted: May 22, 2007
Published: September 7, 2007

Citation
David S. Monaghan, Unnikrishnan Gopinathan, Thomas J. Naughton, and John T. Sheridan, "Key-space analysis of double random phase encryption technique," Appl. Opt. 46, 6641-6647 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-26-6641

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