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Chin. Phys. B, 2022, Vol. 31(3): 034205    DOI: 10.1088/1674-1056/ac1b87

Color-image encryption scheme based on channel fusion and spherical diffraction

Jun Wang(王君)1,†,‡, Yuan-Xi Zhang(张沅熙)1,†, Fan Wang(王凡)1, Ren-Jie Ni(倪仁杰)1, and Yu-Heng Hu(胡玉衡)2
1 Sichuan University, School of Electronics and Information Engineering, Chengdu 610065, China;
2 Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
Abstract  A secure encryption scheme for color images based on channel fusion and spherical diffraction is proposed in this paper. In the proposed encryption scheme, a channel fusion technology based on the discrete wavelet transformation is used to transform color images into single-channel grayscale images, firstly. In the process of transformation, the hyperchaotic system is used to permutate and diffuse the information of red—green—blue (RGB) channels to reduce the correlation of channels. Then the fused image is encrypted by spherical diffraction transform. Finally, the complex-valued diffraction result is decomposed into two real parts by the improved equal module decomposition, which are the ciphertext and the private key. Compared with the traditional color image encryption schemes that encrypt RGB channels separately, the proposed scheme is highly secure and robust.
Keywords:  channel fusion      hyper-chaotic system      asymmetric encryption      spherical diffraction  
Received:  16 May 2021      Revised:  01 August 2021      Accepted manuscript online:  07 August 2021
PACS:  42.30.-d (Imaging and optical processing)  
  42.30.Va (Image forming and processing)  
  42.40.My (Applications)  
  42.40.Kw (Holographic interferometry; other holographic techniques)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. U1933132) and the Chengdu Science and Technology Program, Sichuan Province, China (Grant No. 2019-GH02-00070-HZ).
Corresponding Authors:  Jun Wang     E-mail:

Cite this article: 

Jun Wang(王君), Yuan-Xi Zhang(张沅熙), Fan Wang(王凡), Ren-Jie Ni(倪仁杰), and Yu-Heng Hu(胡玉衡) Color-image encryption scheme based on channel fusion and spherical diffraction 2022 Chin. Phys. B 31 034205

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