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Image Encryption Based on Gyrator transform research

Author: ZhangYanLi
Tutor: LiuShuTian
School: Harbin Institute of Technology
Course: Optics
Keywords: Gyrator transform Image Encryption Pixel Scrambling Double random phase encoding Digital watermarking
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 69
Quote: 1
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Abstract


Has a large capacity optical information processing speed, and the device is simple parallelism, etc., and such information may be hidden in the phase or spatial frequency and other parameters, so the optical information processing of the optical image is a line of security encryption effective way. In recent years, fractional Fourier transform mathematical transformation emerging as much attention of people, it is in the field of optics, the information processing and other aspects and advantages are increasingly found widespread applications, particularly in the application of image encryption is one of the more popular area . Compared with this, belong to the same linear canonical integral transform Gyrator transform as a means of information processing has not been known to everyone. Gyrator transform and fractional Fourier transform is the same as the conventional Fourier transform extended form, which further extends the transformation category. This system will be extended to the Fourier transform Gyrator transform the system, mainly studied in double random phase encoding technology and Pixel Scrambling Technology Based on Gyrator transform optical image encryption method. First, a brief review of the optical image encryption technology research status and development trends, highlights of which are widely used double random phase encoding encryption technology. Followed by a discussion Gyrator transform mathematical physical characteristics, including its definition, basic properties, optical method and numerical algorithm for further application made Gyrator transform theoretical preparation. Then we single grayscale and multiple images using different algorithms for encryption, a random set multiple keys, and each weight keys are extremely important, so that the difficulty of deciphering improved, so the results of image encryption more secure. Finally, computer simulations were validated. In this paper, based Gyrator transform combined with double random phase encoding technology, enabling image encryption, as well as adding in Gyrator transform spectral domain watermarking algorithm, in security and safety certification has application prospects. Finally contrast fractional Fourier transform and Gyrator transform in image encryption merits, transform combined in two double random phase encoding technique a gray image encryption, decryption and then compare the results to make decrypted image and the original image the mean-variance curves compare Gyrator transform flexibility and superiority.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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