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1、畢業(yè)設(shè)計(jì)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(shí)現(xiàn)畢業(yè)設(shè)計(jì)(論文)中文摘要語音加密解密算法研究、仿真和實(shí)現(xiàn)摘要:語音信號(hào)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(hào)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(hào)。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(duì)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
2、強(qiáng)語音信號(hào)的傳輸安全,采用混沌特性將語音信號(hào)進(jìn)行加密,并利用對(duì)稱密碼體制進(jìn)行解密?;煦缦到y(tǒng)對(duì)初始值和系統(tǒng)參數(shù)非常敏感,即使是兩個(gè)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(huì)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(duì)比原語音信號(hào)、加密后的語音信號(hào)與恢復(fù)后語音信號(hào)的波形圖,了解混沌系統(tǒng)在語音加密方面的優(yōu)缺點(diǎn)。關(guān)鍵詞:語音傳輸混沌系統(tǒng)logistic映射對(duì)稱密碼體制河北工業(yè)大學(xué)2013屆本科畢業(yè)設(shè)計(jì)說明書畢業(yè)設(shè)計(jì)(論文)外文摘要TitleVOICEENCRYPTION
3、ANDDECRYPTIONALGORITHMS,SIMULATIONANDIMPLEMENTATIONAbstract(三號(hào)黑體,居左)Thetransmissionofthevoicesignalwhichinvolvesalmostallaspectsoflifeplaysanimportantroleinmoderncommunication,suchascallingeverydaywiththemobilephone,voicecommandoperationandplayingthesongswhichis
4、recordedin.Sometimeswedonotwanttoleakthevoiceinformationsoweencryptitbeforetransmissionanddecryptitafterreceptionaccordingtoencryptionatthetransmitside.Therefore,theinformationcannotbeobtainedeveniftheinformationisinterceptedinthetransmissionfordecryptionisunkno
5、wntotheattacker,thusprotectingtheinformation.Inordertoenhancethesafetyofthetransmissionofvoiceinformation,weadoptthesystemofchaostoencryptitandthesystemofsymmetricalciphertodecrypt.Thecharacteristicofchaosisextremelysensitivetoinitialvalueandthesystemparameters.
6、Itwillbealargegapbetweentwochaossystemseveniftheyareidenticalwhenthereisaslightlydifferenceininitialvalueorsystemparameterafterseveraliteration.Theencryptionprocessuseslogisticmappingofdiscretechaoticencryptionsystem.Byobservingthewaveformcomparisonoftheoriginal
7、voicesignal,encryptedvoicesignalanddecryptedvoicesignal,wecanhaveageneralunderstandingofchaosencryptedsysteminvoiceencryptionanddecryption.Keywords:thetransmissionofthevoicesystemofchaoslogisticmappingsymmetricalciphersystem2河北工業(yè)大學(xué)2013屆本科畢業(yè)設(shè)計(jì)說明書目錄1引言(或緒論)-1-1.1課
8、題來源及意義-1-1.2混沌加密簡介及研究現(xiàn)狀-1-1.2.1混沌簡介-1-1.2.2混沌加密研究現(xiàn)狀-2-1.3加密解密介紹-2-1.4本論文的主要工作及內(nèi)容安排-3-2語音信號(hào)讀取與預(yù)處理-4-2.1語音信號(hào)的特點(diǎn)與選取-4-2.2語音信號(hào)的預(yù)處理-6-2.2.1語音信號(hào)的頻譜與倒頻譜分析-6-2.2.2語音信號(hào)的matlab