Aspects of image transmission on the governemental communications systems

Abstract

Data security became a very important problem in our days. For this reason the algorithms involved get faster and more resistant to cryptographic attacks. Because of the improvement of the channels, images are more often used in data transmissions. In the present article we want to make a study regarding usage of chaotic random number generators in image cryptography and to compare the experimental results with those obtained using symmetrical algorithms. Both methods have the advantage of the speed obtained in the cryptographic process. The symmetrical algorithm used in our example is Blowfish, because it is known as a fast and a quite powerful one. We will see that the symmetrical algorithms have some disadvantages when are used in image cryptography.