  In this paper we propose a novel image encryption scheme. The proposed method
is based on the chaos theory. Our cryptosystem uses the chaos theory to define
a dynamic chaotic Look-Up Table (LUT) to compute the new value of the current
pixel to cipher. Applying this process on each pixel of the plain image, we
generate the encrypted image. The results of different experimental tests, such
as Key space analysis, Information Entropy and Histogram analysis, show that
the proposed encryption image scheme seems to be protected against various
attacks. A comparison between the plain and encrypted image, in terms of
correlation coefficient, proves that the plain image is very different from the
encrypted one.
