TAILIEUCHUNG - Báo cáo sinh học: " Research Article Improved Adaptive LSB Steganography Based on Chaos and Genetic Algorithm"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Improved Adaptive LSB Steganography Based on Chaos and Genetic Algorithm | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 876946 6 pages doi 2010 876946 Research Article Improved Adaptive LSB Steganography Based on Chaos and Genetic Algorithm Lifang Yu Yao Zhao Rongrong Ni EURASIP Member and Ting Li Institute of Information Science Beijing Jiaotong University Beijing 100044 China Correspondence should be addressed to Yao Zhao yzhao@ Received 17 November 2009 Accepted 19 May 2010 Academic Editor Yingzi Du Copyright 2010 Lifang Yu 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 novel steganographic method in JPEG images with high performance. Firstly we propose improved adaptive LSB steganography which can achieve high capacity while preserving the first-order statistics. Secondly in order to minimize visual degradation of the stego image we shuffle bits-order of the message based on chaos whose parameters are selected by the genetic algorithm. Shuffling message s bits-order provides us with a new way to improve the performance of steganography. Experimental results show that our method outperforms classical steganographic methods in image quality while preserving characteristics of histogram and providing high capacity. 1. Introduction Steganography is the science of hiding messages in a medium called carrier or cover object in such a way that existence of the message is concealed. The cover object could be a digital still image an audio file or a video file. The hidden message called payload could be a plain text an audio file a video file or an image 1 2 . Steganographic methods can be classified into spatial domain embedding and frequency domain embedding. Least Significant Bit LSB replacing is the most widely used steganographic method in spatial domain which replaces the cover .

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