隨著通信技術(shù)的發(fā)展,通信內(nèi)容的信息安全日益重要,國(guó)內(nèi)外相關(guān)研究者開(kāi)展了有關(guān)基于混沌系統(tǒng)的動(dòng)態(tài)和無(wú)序行為的密碼學(xué)研究。由于混沌系統(tǒng)具有對(duì)初始條件/系統(tǒng)參數(shù)的高靈敏度、不穩(wěn)定行為、高安全性和簡(jiǎn)單性等突出特點(diǎn),早已應(yīng)用于信息或數(shù)據(jù),如文本、圖像、音頻和視頻的對(duì)稱(chēng)加密。當(dāng)前在密碼學(xué)領(lǐng)域中使用的混沌理論,存在著數(shù)據(jù)冗余、混沌映射非隨機(jī),特別是一些語(yǔ)音安全系統(tǒng)使用了一維混沌映射,導(dǎo)致攻擊者可以輕松獲取混沌映射的初始狀態(tài)或系統(tǒng)參數(shù),此外一維混沌映射也存在密鑰空間小、安全性差等問(wèn)題,因此開(kāi)展基于混沌映射的音頻加解密算法的相關(guān)研究有著實(shí)際意義和應(yīng)用價(jià)值。論文首先概述了混沌映射和數(shù)字混沌密碼的相關(guān)理論,構(gòu)建了一種基于二維非線性映射和一維邏輯映射的耦合混沌系統(tǒng)。該混沌映射具有不同的參數(shù)值,并根據(jù)一個(gè)函數(shù)對(duì)其軌道進(jìn)行比較,以產(chǎn)生一個(gè)偽隨機(jī)比特流,該系統(tǒng)防止透露偽隨機(jī)序列發(fā)生器結(jié)構(gòu)中使用的混沌映射的信息。提高了系統(tǒng)的安全性,消除密鑰空間小/有限的問(wèn)題,增加了密鑰空間的維數(shù),從而增加了系統(tǒng)的非線性。其次論文闡述了語(yǔ)音的數(shù)字化過(guò)程、加密解密算法過(guò)程、仿真和結(jié)果分析。該算法利用混沌迭代生成對(duì)稱(chēng)加密密鑰,然后對(duì)明文進(jìn)行... 

【文章來(lái)源】：華中師范大學(xué)湖北省 211工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：73 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
中文摘要
ABSTRACT
CHAPTER 1: INTRODUCTION
    1.1 Research Background
    1.2 Research Status of Encryption and Decryption of Audio with Chaotic Mapping
    1.3 Work Content and Innovation
    1.4 Structure of this Thesis
CHAPTER 2: PRINCIPLE OF CHAOTIC MAPPING
    2.1 Chaotic Dynamics
    2.2 Cryptography Based On Digital Chaos
    2.3 Henon Map
    2.4 Logistic Map
    2.5 Pseudo Random Bit Generation
    2.6 Conclusion
CHAPTER 3: ENCRYPTION AND DECRYPTION ALGORITHM SIMULATION OF AUDIOWITH CHAOTIC MAPPING BASED ON MATLAB
    3.1 Principle of Sound Digitization
    3.2 Encryption and Decryption Algorithm Simulation of Audio with ChaoticMapping based on MATLAB
        3.2.1 Encryption and Decryption Algorithm of Audio with Chaotic Mappingbased on MATLAB
        3.2.2 Result Analysis
    3.3 Conclusion
CHAPTER 4: ENCRYPTION AND DECRYPTION APPLICATION OF AUDIO WITH CHAOTICMAPPING
    4.1 Background of Audio Encryption and Decryption application
    4.2 Application Design of Encryption and Decryption About Audio with ChaoticMapping
    4.3 Experiment
    4.4 Result and Discussion
    4.5 Conclusion
CHAPTER 5: CONCLUSION AND PROSPECT
    5.1 Conclusion
    5.2 Prospect
REFERENCES
ACKNOWLEDGEMENT
PUBILISED PAPER
LIST OF ACRONYMS
APPENDIX
    中文摘要


【參考文獻(xiàn)】：
期刊論文
[1]混沌前饋型流密碼的設(shè)計(jì)[J]. 周紅,俞軍,凌燮亭.  電子學(xué)報(bào). 1998(01)



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