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Journal of Electrical and Computer Engineering
Volume 2012 (2012), Article ID 179693, 11 pages
Research Article

A New Chaos-Based Image-Encryption and Compression Algorithm

1Department of Computer Science and Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
2Department of Computer Engineering, College of Engineering, University of Basrah, B.P. 49, Basrah, Iraq

Received 1 September 2011; Revised 20 December 2011; Accepted 17 January 2012

Academic Editor: Ahmed Bouridane

Copyright © 2012 Somaya Al-Maadeed et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a new and efficient method to develop secure image-encryption techniques. The new algorithm combines two techniques: encryption and compression. In this technique, a wavelet transform was used to decompose the image and decorrelate its pixels into approximation and detail components. The more important component (the approximation component) is encrypted using a chaos-based encryption algorithm. This algorithm produces a cipher of the test image that has good diffusion and confusion properties. The remaining components (the detail components) are compressed using a wavelet transform. This proposed algorithm was verified to provide a high security level. A complete specification for the new algorithm is provided. Several test images are used to demonstrate the validity of the proposed algorithm. The results of several experiments show that the proposed algorithm for image cryptosystems provides an efficient and secure approach to real-time image encryption and transmission.