基于圖像空間域信息隱藏關鍵技術研究
發(fā)布時間：2018-07-13 08:55
【摘要】：隨著互聯(lián)網(wǎng)技術和多媒體信息技術的飛速發(fā)展,計算機已經(jīng)走進了千家萬戶�；ヂ�(lián)網(wǎng)使信息交換的形式多種多樣同時不受空間限制,使得數(shù)字多媒體信息在網(wǎng)上傳播越來越便捷,給人們的工作和生活帶來了很大的便利。然而,互聯(lián)網(wǎng)是把雙刃劍,給人們工作和生活帶來便利的同時也帶來信息安全隱患。傳統(tǒng)的信息安全防護措施是通過密碼學對傳輸?shù)拿魑男畔⑦M行加密處理形成一堆無法直接閱讀識別的密文信息,從而達到不被非法分子直接獲取的目的。現(xiàn)階段網(wǎng)絡傳輸中的新問題催生出學者們對信息隱藏(InformationHiding)技術研究的熱潮。信息隱藏技術不同于傳統(tǒng)的密碼學技術,傳統(tǒng)的密碼學技術僅僅做到信息的內(nèi)容不被非法接收者所識別,信息隱藏是將機密信息隱藏到一般的數(shù)字多媒體(視頻、圖像、音頻、文檔文件等)中,隱藏有機密信息的媒體看起來和其他沒有隱藏機密信息的一般媒體相同,從而不容易被非法分子注意和發(fā)覺,容易逃過非法分子的破解和攻擊。本文主要針對目前圖像空間域信息隱藏技術中存在的問題進行了較深入的研究。具體研究內(nèi)容如下:(1)本文首先分析并總結了國內(nèi)外在空間域內(nèi)各種圖像信息隱藏技術的特點。其次,為進一步提高現(xiàn)有的圖像信息隱藏技術的魯棒性、機密信息的藏量(Capacity)以及改善隱密圖像的質(zhì)量,主要做了以下幾個方面的研究:1)為了提高機密信息的藏量,本文提出了一種基于modulo 3策略的圖像信息隱藏方案。本方案通過對載體圖像中每個像素的灰度值進行加一減一操作達到隱藏兩個三進制機密信息的目的,仿真實驗結果表明本方案在載體圖像的藏量和魯棒性方面都有所提高。2)為了提高隱密圖像的質(zhì)量,本文根據(jù)人類視覺系統(tǒng)(HVS)對圖像的平滑區(qū)域比較敏感的特性,提出了一種基于動態(tài)基數(shù)數(shù)制系統(tǒng)(VRNS)的自適應圖像信息隱藏方案。該方案首先把機密信息分段并轉換成動態(tài)基數(shù)數(shù)制系統(tǒng)表示,然后把轉換后的機密信息優(yōu)先藏在載體圖像中比較復雜的區(qū)域從而達到提高隱密圖像視覺質(zhì)量的目的。最后仿真實驗顯示本方案不僅獲得了一個更好的視覺質(zhì)量效果,而且提高了魯棒性。(2)圖像信息隱藏技術已經(jīng)發(fā)展的很迅速,但是目前存在的空間域內(nèi)數(shù)字圖像信息隱藏技術普遍存在一個問題——難抵御數(shù)學統(tǒng)計分析。由于在空間域進行信息隱藏改變了原有圖像像素間的正態(tài)分布特性,使用數(shù)學統(tǒng)計分析工具很容易識破一幅數(shù)字圖像中是否藏有機密信息。信息隱藏技術得以發(fā)展最主要的原因是其偽裝性不易被非法分子重點關注,如果很容易被數(shù)學統(tǒng)計分析工具攻擊,信息隱藏技術的意義就沒有那么重要了。所以本文提出的兩個改進方案均引入了SPAM攻擊測試,最后實驗結果證明本文改進的兩種方案更能抵抗SPAM攻擊,魯棒性都有所提高。
[Abstract]:With the rapid development of Internet technology and multimedia information technology, computers have entered thousands of households. The Internet makes the forms of information exchange various and not restricted by space, making digital multimedia information more and more convenient on the Internet, which brings great convenience to people's work and life. However, the Internet is a double-edged sword, which brings convenience to people's work and life, but also brings hidden trouble of information security. The traditional information security protection measures are to encrypt the transmitted plaintext information through cryptography to form a pile of ciphertext information which can not be read directly, so as to achieve the purpose of not being directly obtained by illegal elements. At present, the new problems in network transmission give rise to the upsurge of the research on information hiding technology. The information hiding technology is different from the traditional cryptography technology. The traditional cryptography technology only makes the content of the information not recognized by the illegal receiver. The information hiding is to hide the confidential information to the general digital multimedia (video, image, audio). In documents and files, the media with secret information looks the same as other media without secret information, so it is not easy to be noticed and detected by illegal elements, and easy to escape the cracking and attack of illegal elements. This paper mainly focuses on the problems existing in image spatial domain information hiding technology. The main contents of this paper are as follows: (1) this paper firstly analyzes and summarizes the characteristics of various image information hiding techniques in spatial domain at home and abroad. Secondly, in order to further improve the robustness of the existing image information hiding technology, the capacity of the secret information and the quality of the secret image, we mainly do the following research: 1) in order to improve the volume of the secret information, This paper presents an image information hiding scheme based on modulo 3 strategy. The scheme can hide two ternary secret information by adding and subtracting the gray value of each pixel in the carrier image. The simulation results show that the proposed scheme improves both the volume and robustness of the carrier image. In order to improve the quality of the hidden image, the human visual system (HVS) is more sensitive to the smooth region of the image in order to improve the quality of the hidden image. An adaptive image information hiding scheme based on dynamic cardinality system (VRNS) is proposed. In this scheme, the secret information is segmented and transformed into a dynamic cardinal number system, and then the converted secret information is first stored in the complex region of the carrier image, so as to improve the visual quality of the hidden image. Finally, the simulation results show that this scheme not only achieves a better visual quality effect, but also improves the robustness. (2) Image information hiding technology has been developed very quickly. However, the existing spatial domain digital image information hiding technology generally has a problem-difficult to resist the mathematical statistical analysis. Because the information hiding in the spatial domain changes the normal distribution between pixels of the original image, it is easy to identify whether a digital image contains secret information by using the mathematical statistical analysis tool. The main reason for the development of information hiding technology is that its camouflage is not easy to be paid attention to by illegal elements. If it is easy to be attacked by mathematical statistical analysis tools, the significance of information hiding technology is not so important. Therefore, the two improved schemes introduced SPAM attack test. Finally, the experimental results show that the two improved schemes are more resistant to SPAM attacks, and the robustness is improved.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP391.41;TP309
本文編號：2118836
[Abstract]:With the rapid development of Internet technology and multimedia information technology, computers have entered thousands of households. The Internet makes the forms of information exchange various and not restricted by space, making digital multimedia information more and more convenient on the Internet, which brings great convenience to people's work and life. However, the Internet is a double-edged sword, which brings convenience to people's work and life, but also brings hidden trouble of information security. The traditional information security protection measures are to encrypt the transmitted plaintext information through cryptography to form a pile of ciphertext information which can not be read directly, so as to achieve the purpose of not being directly obtained by illegal elements. At present, the new problems in network transmission give rise to the upsurge of the research on information hiding technology. The information hiding technology is different from the traditional cryptography technology. The traditional cryptography technology only makes the content of the information not recognized by the illegal receiver. The information hiding is to hide the confidential information to the general digital multimedia (video, image, audio). In documents and files, the media with secret information looks the same as other media without secret information, so it is not easy to be noticed and detected by illegal elements, and easy to escape the cracking and attack of illegal elements. This paper mainly focuses on the problems existing in image spatial domain information hiding technology. The main contents of this paper are as follows: (1) this paper firstly analyzes and summarizes the characteristics of various image information hiding techniques in spatial domain at home and abroad. Secondly, in order to further improve the robustness of the existing image information hiding technology, the capacity of the secret information and the quality of the secret image, we mainly do the following research: 1) in order to improve the volume of the secret information, This paper presents an image information hiding scheme based on modulo 3 strategy. The scheme can hide two ternary secret information by adding and subtracting the gray value of each pixel in the carrier image. The simulation results show that the proposed scheme improves both the volume and robustness of the carrier image. In order to improve the quality of the hidden image, the human visual system (HVS) is more sensitive to the smooth region of the image in order to improve the quality of the hidden image. An adaptive image information hiding scheme based on dynamic cardinality system (VRNS) is proposed. In this scheme, the secret information is segmented and transformed into a dynamic cardinal number system, and then the converted secret information is first stored in the complex region of the carrier image, so as to improve the visual quality of the hidden image. Finally, the simulation results show that this scheme not only achieves a better visual quality effect, but also improves the robustness. (2) Image information hiding technology has been developed very quickly. However, the existing spatial domain digital image information hiding technology generally has a problem-difficult to resist the mathematical statistical analysis. Because the information hiding in the spatial domain changes the normal distribution between pixels of the original image, it is easy to identify whether a digital image contains secret information by using the mathematical statistical analysis tool. The main reason for the development of information hiding technology is that its camouflage is not easy to be paid attention to by illegal elements. If it is easy to be attacked by mathematical statistical analysis tools, the significance of information hiding technology is not so important. Therefore, the two improved schemes introduced SPAM attack test. Finally, the experimental results show that the two improved schemes are more resistant to SPAM attacks, and the robustness is improved.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP391.41;TP309
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相關期刊論文 前2條
1 張偉建;;淺談數(shù)制與轉換[J];數(shù)字技術與應用;2010年07期
2 劉峰,張鵬;信息隱藏技術及其應用[J];天津通信技術;2001年01期
，本文編號：2118836
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