A new 2-D image encryption algorithm based on dual transform
Bin He · Optical Technique · 2015
A new improved image encryption algorithm is proposed. The rows and columns of 2D matrix is mapped into 1D vector by making use of new proposed scrambling method based on pixel position. Then using the logistic mapping to generate a set of pseudo sequence,the pseudo sequence is ranked from small to large. The position that corresponds to each element is recorded by group sequence,which called key stream. Finally the corresponding pixel position of 1D vector is scrambled by index value which is formed by key stream. The encrypted image is obtained by 1D vector rearranged into a new 2D matrix. In addition,the new proposed method based on pixel position is extended to color image R,G,B components and dual scrambling based on color image pixel position and intensity value. The experimental results show that the proposed method has a large key space,and the scrambled image has a histogram distribution of white noise. It is greatly increasing the safety of encrypted image.