Enhancement of RC4 Algorithm for Images Encryption

Abstract

The increase use of the electronic communication demands more security on the exchange of the critical information. cryptography now a day’s get more and more important to address this issue. encryption algorithms available for textual data are highly efficient. but sometime the information is available in form of image. in such cases we need a specialized algorithm that is highly optimized to protect pictorial information. in this research two state tables are used to solve correlation problem between the public known output of internal state by using permutation between state1 and state2 that is improve the RC4 algorithm. the enhanced RC4 Algorithm is used for images encryption and decryption the results obtained show that, the enhanced RC4 achieved high security compared with standard RC4, so it can be used in WEP protocol instead of RC4 to overcome weak keys problem. diehard statistical test tool is used to test the randomness of the enhanced RC4 algorithm, also we measure the efficiency of the method using Peak Signal -to-Noise Ratio (PSNR)and mean squared error (MSE) and results obtained give optimum values of robustness.