Abstract
In this article, enhanced chaotic range map is used for data hiding and multimedia security. By using complex properties of improved chaotic logistic map that include non-periodical motion and non-convergence, a new watermarking algorithm and image encryption scheme is proposed. For image encryption, the process of grayscale substitution in the form of encryption matrix randomly changes all pixel values of an image. In watermarking, the chaotic improved logistic system is used for identifying the embedding locations of the watermark. The Simulation results and statistical analyses specify that our techniques are comparatively secure and effective from existing ones, and are more practicable.