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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 36 — Dec. 20, 2011
  • pp: 6645–6651

Security enhancement of a phase-truncation based image encryption algorithm

Xiaogang Wang and Daomu Zhao  »View Author Affiliations


Applied Optics, Vol. 50, Issue 36, pp. 6645-6651 (2011)
http://dx.doi.org/10.1364/AO.50.006645


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Abstract

The asymmetric cryptosystem, which is based on phase-truncated Fourier transforms (PTFTs), can break the linearity of conventional systems. However, it has been proven to be vulnerable to a specific attack based on iterative Fourier transforms when the two random phase masks are used as public keys to encrypt different plaintexts. An improvement from the asymmetric cryptosystem may be taken by relocating the amplitude values in the output plane. In this paper, two different methods are adopted to realize the amplitude modulation of the output image. The first one is to extend the PTFT-based asymmetrical cryptosystem into the anamorphic fractional Fourier transform domain directly, and the second is to add an amplitude mask in the Fourier plane of the encryption scheme. Some numerical simulations are presented to prove the good performance of the proposed cryptosystems.

© 2011 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
(100.4998) Image processing : Pattern recognition, optical security and encryption

ToC Category:
Fourier Optics and Signal Processing

History
Original Manuscript: June 27, 2011
Revised Manuscript: August 24, 2011
Manuscript Accepted: September 27, 2011
Published: December 15, 2011

Citation
Xiaogang Wang and Daomu Zhao, "Security enhancement of a phase-truncation based image encryption algorithm," Appl. Opt. 50, 6645-6651 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-36-6645

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