Mathematical Problems in Engineering
Volume 2011 (2011), Article ID 938454, 12 pages
doi:10.1155/2011/938454
Research Article

Enhanced Cryptography by Multiple Chaotic Dynamics

1Shenzhen City Key Laboratory of Embedded System Design, College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, China
2Department of Electronic Engineering, City University of Hong Kong, Hong Kong

Received 1 December 2010; Accepted 22 December 2010

Academic Editor: Ming Li

Copyright © 2011 Jianyong Chen 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.

Abstract

A potential security vulnerability of embedding compression in a chaos-based cryptography is studied. Furthermore, a scheme for improving its security is proposed. This correspondence considers the use of multiple chaotic dynamics and drive chaotic trajectory by both plaintext sequence and initial values of a chaotic map. Chaotic trajectory is used for encryption that is never reused for different plaintext. This makes that scheme naturally resist chosen plaintext attack and cipher text-only attack. Its strong security is justified by the key space, key sensitivity, and tests of random number sequences. The results show that the security of the proposed scheme is stronger than the latest algorithm especially in resisting chosen plaintext attack, while its performance is not sacrificed.