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Advances in OptoElectronics
Volume 2017 (2017), Article ID 9802751, 15 pages
Research Article

DWT versus WP Based Optical Color Image Encryption Robust to Composite Attacks

1Faculty of Engineering, Mansoura University, Mansoura, Egypt
2Delta Higher Institute for Engineering and Technology, Talkha, Egypt

Correspondence should be addressed to Mohamed Ismail Fath Allah

Received 9 February 2017; Revised 24 April 2017; Accepted 3 May 2017; Published 5 June 2017

Academic Editor: Samir K. Mondal

Copyright © 2017 M. A. Mohamed 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.


Intensive studies have been done to get robust encryption algorithms. Due to the importance of image information, optical encryption has played a vital role in information security. Many optical encryption schemes have been proposed but most of them suffer from poor robustness. In this paper six proposed algorithms will be presented for optical encryption to be robust to severe attacks: composite attack. Three of these approaches are based on one level Discrete Wavelet Transform (DWT) and the others are based on Wavelet Packet (WP). Not only will new techniques be presented but also a new proposed chaotic map has been developed as random keys for all algorithms. After extensive comparative study with some traditional techniques, it has been found that the novel algorithms have achieved better performance versus conventional ones. Also it has been found that WP based algorithms have achieved better performance than DWT based ones against severe composite attacks.