Method for encrypting and decrypting digital image on the basis of optical vortices

Abstract

The invention discloses a method for encrypting and decrypting a digital image on the basis of optical vortices. The method has the advantages of being simple in encryption and decryption structure and high in safety and also has the advantages of complex encryption and decryption key and simple principle.

Description

technical field [0001] The invention relates to a digital image encryption and decryption method, which belongs to the fields of information security and image processing, in particular to an optical vortex-based digital image encryption and decryption method. Background technique [0002] Modern society is an era of informatization, and various application fields of production and life rely more and more on information. Encryption and decryption technology has important practical significance for finance, communication, national defense and personal information security. [0003] In 1995 by P. Refregier and B. Javidi first proposed dual random phase encoding technology. For the simplified model, only one mask is placed on the spectrum plane of the 4f system. But usually. In order to improve the security of encryption, two statistically irrelevant random phase masks are added to the input plane and the spectrum plane. In this way, the image can be encrypted as Gaussian ...

AI Technical Summary

Problems solved by technology

[0004] After literature search, the patent "Optical Image Encryption Method Based on Fractional Merlin Transformation" (authorization number is ZL201010616865.2, authorization date is 2012.05.02), realizes non-linear transformation encryption of images through fractional Merlin transformation, and improves the security of the encryption system The disadvantage is that the encryption process of this method is complex and the real-time performance is poor; the patent "a double-image encryption method based on fractional Fourier transform" (authorization number is ZL200710176678.5, authorization date is 2011.02.16), this method Two images can be encrypted into one image for simultaneous confidential storage and transmission of two images, which makes its application field relatively narrow; the patent "a double random phase optical color image encryption device and method" (publication number It is CN 102087503 A, the publication date is 2011.06.08), the invention adopts the joint fraction transformation for encryption, which has good flexibility, but its encryption and decryption device is relatively complicated, which limits its application range

[0005] The analysis shows that in the existing public literature, in the research on the encryption method of optical image, there is still a lack of image encryption method with simple encryption structure and high key security.

Images