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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 23 — Aug. 10, 2014
  • pp: 5100–5108

Double-image encryption without information disclosure using phase-truncation Fourier transforms and a random amplitude mask

Xiaogang Wang, Daomu Zhao, and Yixiang Chen  »View Author Affiliations

Applied Optics, Vol. 53, Issue 23, pp. 5100-5108 (2014)

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We present a study about information disclosure in phase-truncation-based cryptosystems. The main information of the original image to be encoded can be obtained by using a decryption key in the worst case. The problem cannot be thoroughly solved by imaginary part truncating, keeping the encryption keys as private keys, or applying different phase keys for different plaintexts during each encryption process as well as the phase modulation in the frequency domain. In order to eliminate the risk of unintended information disclosure, we further propose a nonlinear spatial and spectral encoding technique using a random amplitude mask (RAM). The encryption process involving two security layers can be fully controlled by a RAM. The spatial encoding of the plaintext images and the simultaneous encryption of the plaintext images and the encryption key greatly enhance the security of system, avoiding several attacks that have cracked the phase-truncation-based cryptosystems. Besides, the hybrid encryption system retains the advantage of a trap door one-way function of phase truncation. Numerical results have demonstrated the feasibility and effectiveness of the proposed encryption algorithm.

© 2014 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.0100) Image processing : Image processing
(100.4998) Image processing : Pattern recognition, optical security and encryption

ToC Category:
Image Processing

Original Manuscript: May 14, 2014
Revised Manuscript: June 27, 2014
Manuscript Accepted: July 4, 2014
Published: August 4, 2014

Xiaogang Wang, Daomu Zhao, and Yixiang Chen, "Double-image encryption without information disclosure using phase-truncation Fourier transforms and a random amplitude mask," Appl. Opt. 53, 5100-5108 (2014)

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