Encrypting digital images using cellular automata

Authors:
A. Martín del Rey;G. Rodríguez Sánchez;A. de la Villa Cuenca
Affiliations:
Department of Applied Mathematics, E.P.S. de Ávila, Universidad de Salamanca, Ávila, Spain;Department of Applied Mathematics, E.P.S. de Zamora, Universidad de Salamanca, Zamora, Spain;Department of Applied Mathematics and Computation, E.T.S.I. (ICAI) Universidad Pontificia Comillas, Madrid, Spain
Venue:
HAIS'12 Proceedings of the 7th international conference on Hybrid Artificial Intelligent Systems - Volume Part II
Year:
2012

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Abstract

In this paper a novel symmetric protocol to cipher digital images is introduced. The protocol proposed consists of two iterative phases: The confusion phase and the diffusion phase. The first stage permutes the pixels in the image using a discrete chaotic map (specifically, the Cat map), whereas in the second stage, the pixel values (that is, the color of each pixel) are modified sequentially by means of a reversible memory cellular automata. The proposed protocol is shown to be secure against the more important cryptanalytic attacks.