Text-to-Image Encryption and Decryption Using Piece Wise Linear Chaotic Maps

Generally, if an image is received as a Cipher, it is assumed that the data (to be sent) might be an image, but text can also be encrypted in the format of an image. So to confuse the attacker, this paper proposes a technique that encrypts the text into image using piecewise linear chaotic map (PWLCM). A text file can be taken as input and the proposed algorithm will convert it into a cipher image, which can then be converted back by the decryption process. The advantage of this scheme is that it is quite secure and hard to break. Also, PWLCM Maps is the simplest among chaotic maps. At first, the text is converted from 7-bit ASCII to its double equivalent and then padding is done to get the required matrix to form a structure for the image to which the text will be converted. After that permutation is done to the matrix bits and then diffusion occurs at two stages, first for the rows and then for the columns. Both permutation and diffusion are done using PWLCM map.