The effect of Fractional Fourier transform angle in encryption quality for digital images

Elhoseny, Heba M. and Faragallah, Osama S. and Ahmed, Hossam E. H. and Kazemian, Hassan and El-sayed, Hala S. and Abd El-Samie, Fathi E. (2016) The effect of Fractional Fourier transform angle in encryption quality for digital images. Optik - International Journal for Light and Electron Optics, 127 (1). pp. 315-319. ISSN 0030-4026

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Official URL: http://dx.doi.org/10.1016/j.ijleo.2015.08.152

Abstract

This paper investigates the effect of the angle of the Fractional Fourier transform (FrFT) on encryption quality in a chaotic image cryptosystem. The adopted approach for encryption is 2D chaotic Baker map. This map is applied to the transformed images using FrFT with different angles. We inspect its application to digital images and its exhaustive security investigation. The security investigation contains statistical tests like histogram and correlation coefficient, the maximum and the irregular deviation metrics, and the processing time. Experimental results prove that the rotation angle of the FrFT does not affect the encryption quality. This indicates a wide range of angles that can be used in this transform domain for encryption in addition to increasing the scheme sensitivity and making it hard for the attacker to exactly determine the right angle used in the transform domain.

Item Type: Article
Uncontrolled Keywords: cryptography; image cryptosystem; Chaotic Baker map; Fractional Fourier transform; FrFT; security analysis
Subjects: 000 Computer science, information & general works
500 Natural Sciences and Mathemetics > 510 Mathematics
Department: School of Computing and Digital Media
Depositing User: Hassan Kazemian
Date Deposited: 13 Nov 2015 14:32
Last Modified: 11 Oct 2016 09:26
URI: http://repository.londonmet.ac.uk/id/eprint/830

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