Cylindrical surface diffraction and interference principle-based image encryption method

Abstract

The invention, aiming at system security hidden danger of an image encryption technology based on an optical interference principle, provides a cylindrical surface diffraction and interference principle-based image encryption method. According to the method, a traditional interference principle-based image encryption method is improved, and an image is encrypted into two pure phase plates by replacing Fresnel diffraction or Fraunhofer diffraction with cylindrical surface diffraction. An inside-out propagation model and an outside-in propagation model of the cylindrical surface diffraction area pair of natural asymmetric diffraction processes, and the cylindrical surface diffraction process is introduced, so that the image encryption method disclosed by the invention solves the "contour display problem", the attack of an iterative recovery algorithm can be resisted, and the security of an encryption system is greatly improved.

Description

Technical field [0001] The invention relates to an information security technology and the field of information optics, especially an image encryption method. Background technique [0002] The application of optical interference principle for image encryption is a hot topic in the field of optical information security research in recent years. In 2008, Zhang Yan and other scholars of Capital Normal University first proposed an image encryption method based on the principle of optical interference [Y. Zhang, B. Wang. Optical image encryption based on interference [J]. Opt.Lett., 2008, 33(21 ): 2443-2445.], using the interference principle to analytically encrypt an image into two phase plates, only using a light intensity detector, such as CCD, can easily obtain the decryption result on the output surface of the decryption system. However, recent studies have shown that the phase plate obtained directly by the interference method has a "contour display problem", that is, when any...

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Problems solved by technology

However, recent studies have shown that there is a "contour appearance problem" in the phase plate obtained directly by the interference method, that is, when any phase plate as the encryption result is placed in the decryption device, the contour of the original image can be obtained on the output surface. There is a great hidden danger in the security of such an encryption system.

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