【正文】
畢業(yè)設(shè)計 學(xué) 院: 信息工程學(xué)院 系 (專業(yè) ): 通信工程 題 目: 語音加密解密算法研究、仿真和實現(xiàn) 河北工業(yè)大學(xué) 2021 屆本科畢業(yè)設(shè)計說明書 畢業(yè)設(shè)計(論文)中文摘要 語音加密解密算法研究、仿真和實現(xiàn) 摘要: 語音 信號的傳輸在當(dāng)代通信中作用很大, 幾乎涉及生活的方方面面,例如每天用手機(jī)打電話,語音命令操作以及歌曲的錄制與播放。在語音應(yīng)用的某些方面我們并不希望信息外泄,因此我們將語音信號在發(fā)送端進(jìn)行加密后再傳輸并根據(jù)發(fā)送端的加密方式在接收端進(jìn)行解密恢復(fù)原先的語音信號。這樣就算在傳輸過程中所傳輸?shù)男畔⒈唤孬@,由于不知道如何解密也不能獲知對應(yīng)的語音信息,從而起到了語音信息的保護(hù)作用。 為了加強(qiáng) 語音信號的傳輸安全,采用混沌特性將語音信號進(jìn)行加密,并利用對稱密碼體制進(jìn)行解密。混沌系統(tǒng)對初始值和系統(tǒng)參數(shù)非常敏感 ,即使是兩個相同的混沌 系統(tǒng) ,如果初始值存在微小的差異 ,經(jīng)過多次迭代后 ,系統(tǒng)會變得差距很大。加密過程使用離散混沌映射加密系統(tǒng)的 logistic 映射。通過觀察對比原語音信號、加密后的語音信號與恢復(fù)后語音信號的波形圖,了解混沌系統(tǒng)在語音加密方面的優(yōu)缺點。 關(guān)鍵詞 : 語音傳輸 混沌系統(tǒng) logistic 映射 對稱密碼體制 河北工業(yè)大學(xué) 2021 屆本科畢業(yè)設(shè)計說明書 1 畢業(yè)設(shè)計(論文)外文摘要 Title VOICE ENCRYPTION AND DECRYPTION ALGORITHMS,SIMULATION AND IMPLEMENTATION Abstract(三號黑體,居左) The transmission of the voice signal which involves almost all aspects of life plays an important role in modern munication, such as calling everyday with the mobilephone ,voice mand operation and playing the songs which is recorded in. Sometimes we do not want to leak the voice information so we encrypt it before transmission and decrypt it after reception according to encryption at the transmit side. Therefore, the information can not be obtained even if the information is intercepted in the transmission for decryption is unknown to the attacker, thus protecting the information. In order to enhance the safety of the transmission of voice information, we adopt the system of chaos to encrypt it and the system of symmetrical cipher to decrypt. The characteristic of chaos is extremely sensitive to initial value and the system parameters. It will be a large gap between two chaos systems even if they are identical when there is a slightly difference in initial value or system parameter after several iteration. The encryption process uses logistic mapping of discrete chaotic encryption system. By observing the waveform parison of the original voice signal, encrypted voice signal and decrypted voice signal, we can have a general understanding of chaos encrypted system in voice encryption and decryption. Keywords: the transmission of the voice system of chaos logistic mapping symmetrical cipher system 河北工業(yè)大學(xué) 2021 屆本科畢業(yè)設(shè)計說明書 2 目 錄 1 引 言(或緒論) ................................................ 1 1. 1 課題來源及意義 ............................................ 1 混沌加密簡介及研究現(xiàn)狀 ...................................... 1 混沌簡 介 ............................................. 1 混沌加密研究現(xiàn)狀 ...................................... 2 加密解密介紹 ................................................ 2 本論文的主要工作及內(nèi)容安排 .................................. 3 2 語音信號讀取與預(yù)處理 .......................................... 4 語音信號的特點與選取 ....................................... 4 語音信號的預(yù)處理 ........................................... 6 語音信號的頻譜與倒頻譜分析 ........................... 6 語音信號的 matlab 分析 ................................. 8 3 語音信號加 密解密設(shè)計 ....................................... 10 加密方案設(shè)計 ............................................. 10 加密方案的選用分析 .................................. 11 混沌 加密方案的具體流程 .............................. 12 解密方法 ................................................. 13 4 語音信號加密解密算法程序設(shè)計 ................................. 13 算法步 驟 ................................................... 13 算法流程圖 ................................................. 14 結(jié) 論 .......................................................... 16 參 考 文 獻(xiàn) ..................................................... 20 致 謝 .......................................................... 22 附錄 ................................................. 錯誤 !未定義書簽。 河 北工業(yè)大學(xué) 2021 屆本科畢業(yè)設(shè)計說明書 1 1 引言(或緒論) 現(xiàn)代信息通信技術(shù)的發(fā)展迅速,已經(jīng)實現(xiàn)設(shè)備的移動化,功能的智能化,傳輸?shù)臒o線化,對語音的應(yīng)用也向著這些方面發(fā)展,語音傳輸設(shè)備的可移 動性,語音傳輸