Coherent structure-based image transmission encryption and decryption method and system

Abstract

The invention provides an image transmission encryption and decryption method and system based on a coherent structure, according to the scheme, an encryption system carrying an encryption key is constructed, image information is encrypted into a partially coherent optical coherent structure, the partially coherent optical coherent structure carrying encryption information is regulated and controlled by introducing a controllable regulation and control function T, by regulating and controlling the intensity factor, after the partially coherent light coherent structure with the encrypted information is transmitted for a long distance, the far-field damaged or evolved coherent structure can be recovered to the coherent structure distribution form at the light source, and finally the coherent structure information measured in the far-field is essentially equivalent to the coherent structure information at the measured light source; after a decryption key is known and coherent structure information is measured, image information encrypted in a light source coherent structure can be safely decrypted in a far field.

Description

technical field [0001] The disclosure belongs to the technical field of image encryption and decryption transmission, and in particular relates to an image transmission encryption and decryption method and system based on a coherent structure. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As a fundamental property of the statistical properties of random light fields, optical coherence plays an important role in understanding light and how it interacts with matter. Optical coherence, especially spatial coherence, affects many interesting optical phenomena in many applications. By adjusting the spatial coherence length, the image quality of the microscope can be greatly improved, and the negative effects such as field degradation caused by turbulence in optical communication can be reduced. It has very important applications in the field...

AI Technical Summary

Problems solved by technology

However, the above encryption scheme only proposes to use the coherent structure of the light beam for encryption, and does not introduce key information, and the encrypted information cannot be adapted to long-distance transmission; The fractional order of Fourier transform is used as the encryption key to encrypt the plaintext (image) into the coherent structure of partially coherent light. Through the generalized HBT experiment, the real part and imaginary part information of the coherent structure are measured at the light source, and the inverse fractional Fourier Leaf transform and then decrypt the image information loaded into the coherent structure, but this encryption scheme is also limited to the light source surface, and does not involve long-distance transmission

[0006] The inventor found that the coherent structure of partially coherent beams is subjected to the inevitable beam diffraction effect during long-distance transmission, the coherent structure is greatly damaged, and the invariance of transmission cannot be maintained. The coherent structure is used as an information carrier, especially a carrier of encrypted information , it is difficult to avoid object information loss after long-distance transmission

Therefore, it is a serious challenge to encrypt the image information into the coherent structure of partially coherent light, transmit it over long distances, especially in complex environments, such as atmosphere and ocean turbulence, and then decrypt and restore it in the far field.

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