Affine cipher extended to (Z/pZ) and it´s application in images

In this work, we propose a new encryption method of still images based on the affine encryption principle for achieve a transposition and perform some manipulations to reduce the quantity of bits. The application of this method on images, gave a high degree of safety and a minimum processing time proportional to the number of pixels, during the encryption and the decryption. The comparison of this approach with the encryption method using injection of noise on the architecture of artificial neural networks, the DES encryption and the AES encryption showed that it is more efficient.