Optical encryption system and method based on random light field spatial coherent structure regulation and control

Abstract

The invention discloses an optical encryption system and method based on random light field space coherent structure regulation and control. The system comprises a light source assembly and an encryption light path; the light source assembly comprises a laser and a linear polarizer, and a first convex lens, a random phase screen and a second convex lens are sequentially arranged in the encryption light path. The complete phase line polarized light passes through a to-be-encrypted object and then enters a first convex lens, the first convex lens projects an image of the to-be-encrypted object to a random phase screen, and the random phase screen converts the complete phase line polarized light containing the image of the to-be-encrypted object into non-phase line polarized light. And the second convex lens performs fractional order Fourier transform on the non-phase line polarized light and encrypts optical information contained in the non-phase line polarized light. The method is optical encryption based on random light field second-order statistical characteristic regulation and control, the security is high, ciphertext information is difficult to measure, the corresponding decryption method is novel, ciphertext measurement is not needed, the encrypted light robustness is good, and the turbulence influence can be overcome to a certain extent.

Description

technical field [0001] The present invention relates to the technical field of optical encryption, in particular to an optical encryption system and method based on random light field spatial coherence structure control. Background technique [0002] With the progress of the times and the development of science and technology, the importance of various information security has become more and more immeasurable, ranging from personal data privacy, such as mobile payment, to national military secrets. During the transmission of information, we often need to encrypt the data to ensure the security of the information. There are many encryption technologies, the purpose of which is to change or cover up the original data by some special means, so that even if unauthorized users obtain the encrypted information, they still cannot obtain the original information because they do not know the decryption method. content, so as to ensure the safe transmission of information. [0003]...

AI Technical Summary

Problems solved by technology

[0010] The existing technology has the following problems: information encryption is based on determining the first-order light field characteristics of the light field, and the first-order light field characteristics are easily interfered in the process of interacting with matter, so that the light field characteristics change , the loaded information is destroyed; in complex environments, such as in the process of turbulent atmospheric transmission, ciphertext errors are extremely prone to occur, which reduces the effectiveness of encryption; the first-order light field characteristics in encryption methods, that is, ciphertext information is generally easy measurement, thus reducing the security of the encrypted system

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