A new method of multi color image encryption

Abstract

A new method of multi color image encryption based on fractional discrete Fourier transform (FrDFT) and 3D Arnold chaotic map (ACM) is proposed in this paper. In this method, first three color images are converted into Bayer color images then these Bayer images are taken as red, green and blue components of a true color image. These three Bayer images are horizontally combined into a single complex image matrix then half of the part of this single matrix is considered as real part and other half part is considered as imaginary part and apply 2D FrDFT. After applying 2D FrDFT separate the image matrix into three components and apply 3D ACM on each of these components and combining these three components we get encrypted image. Decryption of the proposed method is same as encryption but in reverse order. Experimental results are done with various images. Key space, key sensitivity analyses are done for the proposed method. Entropy, histogram, MSE, PSNR and correlation analyses are given. These analyses and experimental results show that our method is a strong enough against these statistical attacks.