No abstract

Abstract

In this study, we are doing a cryptography scheme which can modify the visualization of pictures. The image protection is very critical. It does not alter the value of the header and the metadata. We are just trying to modify the color intensities. Every image consists of three color layers. There are red, green and blue (RGB). Each layer has numbers which represent the intensity. RC4 is used to change the color intensity in every layer. The encryption process it to manipulate the integer number and produce the encrypted value. We determine how many layers are going to be encrypted. The fuzziness of the encrypted image depends on how many layers are included. The visualization will be unrecognized after the encryption. It changes to a noisy picture. This method makes the image content secure and undetected.

Rail Fence Cipher is a further development method of Caesar Cipher. In Caesar algorithm, the results derived from the ciphertext letters shifting each character in the plaintext. While in the Rail Fence, it is taken from the ciphertext block formation matrix diagonally. The level of security in this method has advantages than in the previous method. In this study, the research tries to encrypt and decrypt the message using the Rail Fence algorithm. The ciphertext is obtained by taking a certain set of characters in the line that has been determined earlier.

This paper already publish (Post Print) in International Journal of Research In Science & Engineering Volume: 3 Issue: 3 May-June 2017