Image encryption approach based on a new invertible two-dimensional map
Yong Feng · Optical Technique · 2007
A new invertible two-dimensional map which can be used in image encryption is proposed.The map consists of the left map and the right map.It can encrypt images by processing image stretch-and-fold.Firstly a square image is divided into two parts by diagonal and a parallelogram is reformed.Utilizing the difference of the pixel numbers of two adjacent columns of the parallelogram image,each pixel in a column is inserted to the adjacent column.Then,the original image can be stretched to a line.Finally the line is fold over to a new square image which size is same as the original image.The algorithm of the map is formlated, a method of key generation is designed and the security of the proposed image encryption is analyzed.The simulation results show that the proposed encryption approach is valid.