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The Scientific World Journal
Volume 2014 (2014), Article ID 275818, 7 pages
Research Article

An Improved Piecewise Linear Chaotic Map Based Image Encryption Algorithm

1School of Information, Guangdong University of Finance & Economics, Guangzhou 510320, China
2School of Information Science and Engineering, Central South University, Changsha 410083, China

Received 5 August 2013; Accepted 14 November 2013; Published 23 January 2014

Academic Editors: Y. Lu and J. Shu

Copyright © 2014 Yuping Hu 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.


An image encryption algorithm based on improved piecewise linear chaotic map (MPWLCM) model was proposed. The algorithm uses the MPWLCM to permute and diffuse plain image simultaneously. Due to the sensitivity to initial key values, system parameters, and ergodicity in chaotic system, two pseudorandom sequences are designed and used in the processes of permutation and diffusion. The order of processing pixels is not in accordance with the index of pixels, but it is from beginning or end alternately. The cipher feedback was introduced in diffusion process. Test results and security analysis show that not only the scheme can achieve good encryption results but also its key space is large enough to resist against brute attack.