期刊
OPTICS COMMUNICATIONS
卷 284, 期 12, 页码 2789-2796出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2011.02.066
关键词
Chaotic encryption; Fractional Fourier transform; Random-phase encoding; Color image encryption; Information security
类别
资金
- National Natural Science Foundation of China [10647133, 11047152]
- Natural Science Foundation of Jiangxi Province [2009GQS0080, 2010GZC0160]
- Research Foundation of the Education Department of Jiangxi Province [GJJ11339]
- Nanchang University
A new color image encryption algorithm based on fractional Fourier transform (FrFT) and chaos is proposed. The colors of the original color image are converted to HSI (hue-saturation-intensity), and the S component is transformed by the random-phase encoding based on FrFT to obtain a new random phase. The I component is transformed by double random-phase encoding based on FrFT using the H component and the new random phase as two phase plates. Then chaos scrambling technology is used to encrypt the image, which makes the resulting image nonlinear and disorder both in spatial domain and frequency domain. Additionally, the ciphertext is not a color image but a combination of a gray image and a phase matrix, so the ciphertext has camouflage property to some extent. The results of numerical simulations demonstrate the effectiveness and the security of this algorithm. (C) 2011 Elsevier B.V. All rights reserved.
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