In the current scenario data security is an important and crucial aspects. It is crucial in terms of different domains and application areas like banking, enterprises, educational institutes, etc. In this paper a survey and analysis have been presented on the role of image cryptography and related computational methods. This paper covers and highlighted different cryptography, steganography and related computational methods in case of image data security. It also covers the areas of applicability and the gaps in the previous methods. The impact of the current results has been analyzed also along with the implication.

In our approach the combination of RC4 and Blowfish algorithms with chaos mapping (RC4BC) has been presented for the image encryption. In the first phase image dataset has been considered. Then weight values have been calculated based on the image pixels. It has been calculated based on the attribute pixel, corelated pixels and the analytical factors of the edges. Then substitution has been performed through RC4 encryption mechanism. The substitution has been performed based on 8 sub blocks for the first time. After that different random substation has been applied based on the reallocation of bytes up to 16 rounds. Final substitution has been performed by the blowfish and chaos mapping. By this method the pixels of the images are rotated and shuffled with the XOR operation along with 16-byte reshuffling in each iteration. A total of 50 rounds have been considered for the shuffling, rotation and mapping. Then for comparative analysis peak signal to noise ratio (PSNR) and mean square error (MSE) have been calculated. Our results show that it is efficient in terms of MSE and PSNR values.