Security Enhancement for Digital Images using Chaotic Maps

The chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. In this paper an algorithm for encryption & decryption of digital image using chaotic logistic map and Arnold cat map is discussed. The algorithm utilizes the good features of chaotic sequence related to cryptographic properties, such as pseudo-random, sensitivity to initial conditions and aperiodicity. The algorithm use logistic mapping to confusion the location of pixels in a digital image & 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.