Asymmetric optical image encryption method based on cylindrical diffraction transformation and equivalent mode decomposition

Abstract

The invention provides an asymmetric optical image encryption method based on cylindrical diffraction transformation and equivalent mode decomposition. The method can effectively resist attacks of aniteration recovery method. According to the method, a classical asymmetric optical encryption technology based on equivalent mode decomposition is simply improved; cylindrical diffraction is used forreplacing Fresnel diffraction or Fraunhofer diffraction, and a pure amplitude ciphertext and a pure phase private key are used for replacing two complex amplitude masks, so that the security of the encryption method can be greatly improved, and particularly, the attack of an iterative recovery method can be resisted.

Description

technical field [0001] The invention relates to the technical fields of information security and information optics, in particular to an optical image encryption method. Background technique [0002] The application of optical diffraction theory in image encryption is a hot topic in the field of optical information security research in recent years. In 2015, Cai Jianjun and other scholars proposed an asymmetric optical encryption method based on coherent superposition and equal modulus decomposition [J. J. Cai, X. J. Shen, M. Lei, C. Lin, and S. F. Dou. Asymmetric optical cryptosystem based on coherent superposition and equal modulus decomposition [J] . Opt.Lett., 2015, 40(4): 475-478.], this method is the successful application of optical diffraction theory in the field of information security, which has triggered a series of research by related scholars. However, because the system still has the risk of being attacked by the iterative recovery algorithm, the security of t...

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However, since the system still has the risk of being attacked by the iterat

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