RC4 Stream Cipher Based Digital Color Image Encryption Using Chaotic Systems
Sefa Tunçer Cihan Karakuzu F. UÇAR
AbstractRC4 is an algorithm that encrypts a data in the form of a bit string with a specified key. The security of RC4 with high encryption speed depends on the random key. Speed of image encryption is very important parameter due to size of the data. Performance analysis was examined using color image encryption, because RC4 is usually used in speed-critical applications. RC4 showed that the desired values could not be obtained when examining the histogram, correlation coefficient and information entropy analysis results. Because of this, chaotic systems are used to increase the performance criteria of image encryption with RC4. Chaotic systems are very sensitive due to their inherent dependence on the initial conditions and dynamic variables. Not random and non-periodic oscillations these systems are performed in a certain frequency range. The RC4 algorithm are enhanced by using chaotic system-based encryption algorithms because of its key size capability and speed. Performance criteria have been improved using 2D Cat Map, Tent Map and Lorenz chaotic systems. When we examine only the encryption made with RC4 and the encryption made with RC4 supported with chaotic systems; more successful results are obtained from histogram, correlation coefficient and knowledge entropy analysis. In addition, the structure of chaotic systems is increased key sensitivity and key size and thus a more secure algorithm is obtained.