Image Encryption Algorithm based on Chaotic Map Lattice and Arnold cat map for Secure Transmission
Sudhir Keshari, Shri Gopal Modani · 2011
In recent years, it is seen that chaos system plays significant role in image cryptography for secure transmission. In this paper an algorithm for encryption & decryption of digital image using chaotic map lattice (CML) and Arnold cat map is discussed. The basic idea behind this is to convert the image, pixel by pixel, to chaotic map variables by iterating chaotic map using initial conditions. After a small number of iterations, a certain number of cycles and changing pixel positions using Arnold cat map, image becomes unpredictable. Image size, initial conditions, number of iterations, number of cycles and Arnold cat map parameters are to be considered as secret keys for securing an image. Due to change of any secret keys the system produces undesired results at the receiver side. Finally experimental results along with statistical analysis including histogram analysis and correlation property show that presented algorithm has good desirable cryptography properties and is more secure technique against the unauthorized person.