Cascade Fresnel holographic encryption system and method combining two-dimensional chaos and constrained optimization algorithm

Abstract

The invention discloses a cascade Fresnel holographic encryption system and method combining two-dimensional chaos and a constrained optimization algorithm. The system comprises a laser, a spatial filter, a lens, a first beam splitter and a first mirror. A second mirror is arranged on the lower end of the first beam splitter. A second beam splitter is arranged on the lower end of the first mirror. A chaotic random phase mask is arranged between the second mirror and the second beam splitter. A charge coupling device camera is arranged on the other side of the second beam splitter. The method comprises the steps of key generation, image encryption and image decryption. According to the invention, the problem that plural encrypted images are not easily directly recorded is solved from the aspect of an optical system; the problem that a dynamic video cannot be encrypted is solved from the aspect of a recovery algorithm; and key management and transmission are realized from the aspect of a key generation method.

Description

Technical field [0001] The invention belongs to the technical field of information security and optical information processing, and particularly relates to a cascaded Fresnel holographic encryption system and method combining two-dimensional chaos and constrained optimization algorithms. Background technique [0002] As one of the most popular multimedia forms at present, digital images are widely used in politics, economy, military, education and other fields. In today's highly developed Internet technology, how to protect digital images from tampering, illegal copying and dissemination has important practical significance. The research on image encryption technology has become one of the hot spots in the current information security field. Because optical information processing technology has the advantages of high processing speed, high parallelism, and fast realization of convolution and related operations, in recent years, the use of optical methods for digital image encryp...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cascaded Fresnel holographic encryption system and method combined with two-dimensional chaos and constraint optimization algorithms, which mainly solves the inconvenience that the encrypted image is in complex form from the optical system The problem of direct recording solves the problem of not being able to encrypt dynamic video from the recovery algorithm, and solves the problem of key management and transmission from the key generation method

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