使用DAES演算法進行影像加密暨傳輸之設計與實現｜國立臺灣科技大學博碩士論文系統

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研究生：	鍾天雲 Tien-Yun Chung
論文名稱：	使用DAES演算法進行影像加密暨傳輸之設計與實現 Design and Implementation of Image Encryption-Then-Transmission Using DAES Algorithm
指導教授：	楊振雄 Cheng-Hsiung Yang
口試委員:	郭永麟 Yong-Lin Kuo 陳金聖 Chin-Sheng Chen 吳常熙 Chang-Shi Wu
學位類別：	碩士 Master
系所名稱：	工程學院 - 自動化及控制研究所 Graduate Institute of Automation and Control
論文出版年：	2018
畢業學年度：	106
語文別：	英文
論文頁數：	93
中文關鍵詞：	渾沌系統、DNA 、像素打散、圖片加密、Wi-Fi 、FPGA
外文關鍵詞：	Chaos System, DNA, Pixel Break-up, Image Encryption, Wi-Fi, FPGA
相關次數：	點閱：618 下載：0
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在本論文中，我們基於Altera FPGA DE2-115設計了一套結合四維渾沌及DNA編碼的改良型AES加密技術，並架設了Wi-Fi無線傳輸環境模擬驗證。

首先透過二維相圖、對稱性分析、平衡點分析、散度分析與Lyapunov指數圖，分析本文提出的新四維度渾沌系統，並將產生出來的渾沌訊號應用在新加密法中。

在加密法中，一共有四個特色，第一，明文圖片的資訊會影響隨機序列的變化; 第二，加密循環次數降低; 第三，渾沌序列結合DNA，會讓數據的取代更多變化；第四，我們採用四種運算來打亂圖片的像素質。

我們使用多張性質差異很大的圖片，使用MATLAB進行加密效果分析，在加密安全性分析中，我們使用了直方圖分析、相關性係數分析、熵值分析和差異性分析。從這些加密安全性分析的結果，可以看出我們所設計的加密演算法對於彩色圖片的加密效果非常好，適合用隱藏彩色圖片的訊息。

In this thesis, we based on Altera FPGA DE2-115 to design 4D chaotic and Modified DNA encoding. In addition, we set up Wi-Fi wireless environment simulation verification.

Firstly, through the 2D phase diagram, symmetry analysis, equilibrium analysis, divergence analysis and Lyapunov exponent graph to analyze 4D chaotic system, which produces chaotic signals, use in the new encryption method.

In the encryption method, there are four characteristics. First, the information of the plaintext image affects the random sequence. Second, reduced Round of encryption. Thirdly, DNA combined with the chaotic sequence will make substitution cipher more diversified. Fourth, we use four logic operations to disrupt the pixel quality of the image.

We use multiple different character pictures and use MATLAB for encryption analysis. In the analysis of encryption security, we use histogram analysis, correlation coefficient analysis, entropy analysis, and variance analysis. From the results of these cryptographic security analyses, it shows that the encryption algorithm we designed has a very good effect on the encryption of color pictures and is suitable for hiding messages of color images.

摘要    i
Abstract    ii
誌謝    iii
List of Figure    vii
List of Table    xii
Chapter 1 Introduction    1
1    Introduction    1
2    Motivation and Objectives    2
3    Literature Review    3
Chapter 2 Nonlinear Dynamics Analysis of the 4D Chaotic System    6
1 The novel chaotic system    6
2 Divergence Analysis    7
3 Equilibrium Analysis    8
4 Phase portraits    9
5 Lyapunov Exponent    10
Chapter 3 DAES Encryption Algorithm    13
1 Glossary of Terms and Acronyms    13
1 DNA Encoding    14
2.1 DNA BOX    15
2.2 DNA Computing    16
2 The generation of pseudo-random number sequences    17
2.1 The start point of chaotic sequence    18
2.2 Generate the sequence of DAES    18
3 Proposed encryption algorithm of DEAS    20
3.2 Key Schedule    22
3.3 The SubBytesEx Step    25
3.4 ShiftRows Process    26
3.5 The MixColumns Step    26
3.6 The AddRoundKeyEx Step    27
4 DAES decryption process    28
4.1 The InvShiftRows Step    29
4.2 The InvSubBytesEx Step    30
4.3 The InvMixColumns Step    30
4.4 Inverse of the InvAddRoundKeyEx Step    31
Chapter 4 Implementation of Image Encryption with Chaotic Signals    32
1 Development environment    32
1.1 FPGA    32
1.2 DE2-115    33
1.3 RFS    35
1.4 Altera Quartus II    35
1.5 NIOS II    36
2 FPGA-Based Hardware System for Image Encryption Implementation    37
3 The Design and Verification of Chaotic Sequence Generator    38
3.1 Discretization of chaotic system    38
3.2 IEEE Standard for Floating-Point Arithmetic (IEEE 754)    39
3.3 Altera Floating-Point IP Cores    40
3.3 Using IP Core to Construct Chaotic Generator    41
3.4 Verification of Chaotic Generator    43
4 Input / Output Interface    45
4.1 SD Card    45
4.2 VGA Display    46
5 Wireless Communication Module Design    47
5.1 Wi-Fi chip parameter setting    47
5.2 Communication Protocol    49
5.3 Transmission process and test results    51
Chapter 5 Security Analysis of Image Encryption    54
1 Histogram Analysis    54
2 Correlation Analysis    57
3 Information Entropy Analysis    70
4 Differential Attack Analysis    71
4.1 NPCR Analysis    72
4.2 UACI Analysis    73
Chapter 6 Conclusion    75
1 Conclusion    75
2 Future Work    76
Reference    77


                                

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全文公開日期 2023/08/01 (校內網路)
全文公開日期本全文未授權公開 (校外網路)
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