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The Research of Information Hiding Based on Chaos and Wavelet Domain

Author: KouLiJuan
Tutor: ChenYuanZuo
School: Guangxi Normal University
Course: Computer Software and Theory
Keywords: information hiding digital image image encryption information divided-storage wavelet transform
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 19
Quote: 2
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Abstract

With the vast developing of the computer network and multimedia technology,information security has became an important research area because it can largely influence national security and economic development which need some measures to guarantee. Information hiding is an emerging comprehensive information security technology,involving a number of subject knowledge, which has became one of the hot areas of research.Information hiding is a secret communicative way by hiding secret information in other secure media.Effective hiding technology should have many properties,such as better sightlessness,robustness,security and larger hiding capacity.Digital image has become one of main carriers because it has larger amount of redundant information so that it has larger hiding space. At the same time, noise may disturb image in transmission,so information hiding algorithm must have better noise proof. To make better sheltered performance of hiding information, we focus in embedded algorithm and secret information processing. In this paper,digital images as carriers of information hiding techniques, the main research results are as follows:1. Chaotic sequences usually have a good pseudo-randomness and sensitivity characteristic in initial value and parameters. This paper presents the shear of the digital image encryption algorithm based on chaotic sequence breaking the tradition which does not change the traditional image pixel value, only by rearranging the location of image pixels to achieve image scrambling encryption method, breaking all the features of the original image. Even if the attacker gives a malicious image shear attacks,because chaotic sequences’good pseudo-randomness、all separate plane’s mutual- independent for its scrambling plane dispersion of the error bits. in the recovery process through each bit plane pixel neighborhood information recovery, can effectively resist against the shear transform image encryption attack. The experiments show that the method has better efficiency and security, encryption in the shear area of the image area of 75 percent, they can effectively restore the vast majority of information graphics.2.This article give integer wavelet data hiding algorithm for blind extraction based on the information stored against algorithm of data hiding capacity of less need to extract the issue of the original image which based on transform domain. First of all, the encrypted information will be decomposed into incomplete quotient and remainder,then store them separately into carrier image’low-frequency and high-frequency coefficient.;at last, the overflow will be dealed. The experiments shown that the data hidden capacity reached 37.5% in the gray image, meanwhile, the peak signal to noise ratio can be maintained at more than 39dB and the histogram nearly keeps the same.Further more,the algorithm can keep a better attack robustness when facing pepper noise and shearing attack. Lastly,the chaotic encryption makes better pseudo-random features and better security of the secret information.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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