【摘要】：混沌密碼和DNA密碼作為密碼學(xué)的兩個(gè)新的領(lǐng)域,一直得到眾多專(zhuān)家、學(xué)者的高度關(guān)注。兩者在圖像加密中的應(yīng)用更是成為了密碼學(xué)研究中的新的趨勢(shì)。隨著圖像數(shù)據(jù)的急速增長(zhǎng),圖像數(shù)據(jù)安全處理成為了亟待解決的網(wǎng)絡(luò)安全新挑戰(zhàn)。圖像加密是密碼學(xué)、信息安全、圖像處理、可視計(jì)算的交叉方向也是瞄準(zhǔn)科學(xué)研究國(guó)際前沿的新研究方向。其關(guān)鍵難點(diǎn)在于:如何利用適合圖像加密的、新興的密碼學(xué)方法,實(shí)現(xiàn)復(fù)雜度低、安全有效的圖像加密。1.本論文結(jié)合兩個(gè)新的密碼學(xué)領(lǐng)域,深入開(kāi)展基于DNA編碼與混沌映射的灰度圖像和彩色圖像加密方法研究。重點(diǎn)研究關(guān)于面向圖像加密方法的混沌映射的特性,應(yīng)用在圖像加密方法中的DNA編碼的特性;以及基于混沌映射和DNA編碼的灰度圖像加密方法和彩色圖像加密方法;最后是有關(guān)圖像加密方法安全性的分析與測(cè)試等方面的內(nèi)容。2.文章中首先對(duì)現(xiàn)有算法做了相關(guān)分析,并得出結(jié)論:單獨(dú)的使用混沌映射或者DNA編碼并非是圖像加密的最好的解決辦法,而將兩者結(jié)合起來(lái)是圖像加密發(fā)展的有利的方向之一。文章中著重的分析了一個(gè)基于兩者的圖像加密方法,并且發(fā)現(xiàn)其存在著致命的問(wèn)題:加密方法不可逆。本文正是針對(duì)這一關(guān)鍵問(wèn)題展開(kāi)研究。在研究過(guò)程中,提出了一種針對(duì)灰度圖像加密的方法,并將灰度圖像加密方法思路應(yīng)用到彩色圖像加密方法中。本文還對(duì)這兩種加密思路進(jìn)行了相關(guān)的性能分析。3.為了對(duì)本文的圖像加密方法做出更進(jìn)一步的研究,文中用例圖分別給出了其原始圖像與秘密圖像的對(duì)比。并進(jìn)一步的利用圖像加密中常用的性能測(cè)試手段對(duì)該方法進(jìn)行了相關(guān)的測(cè)試,其中包括:密鑰空間分析,抗差分攻擊分析,相關(guān)性分析等。4.本文中提出的圖像加密方法不僅解決了原始方案的可逆性,而且還將混沌映射的特性和DNA編碼的特性緊密結(jié)合起來(lái),并將其應(yīng)用到彩色圖像加密方法中。最重要的是,經(jīng)過(guò)相關(guān)測(cè)試,其擁有較高的安全性和有效性。本文的內(nèi)容也許會(huì)促進(jìn)生物學(xué)領(lǐng)域和密碼學(xué)領(lǐng)域的研究不斷發(fā)展和有機(jī)交叉。研究成果將在政府、軍事、醫(yī)療、商業(yè)、個(gè)人系統(tǒng)等諸多領(lǐng)域的機(jī)要與隱私保護(hù)方面具有廣泛應(yīng)用前景。
[Abstract]:Chaotic cryptography and DNA cryptography, as two new fields of cryptography, have been paid close attention to by many experts and scholars. The application of both in image encryption has become a new trend in cryptography research. With the rapid growth of image data, image data security processing has become a new challenge to network security. Image encryption is the crossing direction of cryptography, information security, image processing and visual computing. It is also a new research direction aiming at the international frontier of scientific research. The key difficulty lies in how to make use of the new cryptology method suitable for image encryption to realize the low complexity, safe and effective image encryption. In this paper, combining with two new cryptography fields, the gray-scale image and color image encryption method based on DNA coding and chaotic mapping is studied deeply. This paper focuses on the characteristics of chaotic mapping for image encryption, the characteristics of DNA coding applied in image encryption, gray-scale image encryption and color image encryption based on chaotic mapping and DNA coding. Finally, the analysis and test of the security of image encryption methods are given. 2. In this paper, we first analyze the existing algorithms, and draw a conclusion that using chaotic mapping or DNA coding alone is not the best solution for image encryption, and combining them is one of the advantageous directions for image encryption development. This paper focuses on the analysis of an image encryption method based on the two methods, and finds that there is a fatal problem: the encryption method is irreversible. This paper is aimed at this key problem to carry on the research. In the process of research, a method of gray-scale image encryption is proposed, and the idea of gray-scale image encryption method is applied to color image encryption method. The performance analysis of these two encryption ideas is also given in this paper. 3. In order to make further research on the image encryption method in this paper, the comparison between the original image and the secret image is given in the use case diagram. Furthermore, the performance testing methods used in image encryption are used to test this method, including key space analysis, differential attack analysis, correlation analysis, and so on. 4. The key space analysis, anti-differential attack analysis, correlation analysis and so on are used to test the performance of this method. The image encryption method proposed in this paper not only solves the reversibility of the original scheme, but also closely combines the characteristics of chaotic mapping and DNA coding, and applies it to the color image encryption method. Most importantly, after related tests, it has high security and effectiveness. The content of this paper may promote the continuous development and organic intersection of biology and cryptography. The research results will be widely used in many fields, such as government, military, medical, commercial, personal system, and privacy protection.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN918.4

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本文編號(hào)：2433813