Security has become the major concern in maintaining confidentiality of data. Communication within a network requires transfer of data in the form of text as well as images. During the transfer of a digital image security breaches are bound to occur. Hence, the use of cryptographic and encryption algorithm is emphasized and utilized. RC5 which is a block cipher algorithm is used to encrypt the images and to ensure secure wireless communication over the internet. It is seen that RC5 is prone to various attacks such as timing attack, correlation attack, differential and linear attacks when there are lesser number of attacks considered in the algorithm. In this paper, the number of rounds are increased to protect it from such attacks and histograms are plotted for the same. The mean and variance values for the encrypted and decrypted images are computed. © 2015 by IJIR (CESER PUBLICATIONS).