語音保密通信的研究和實現(xiàn).pdf

1、杭州電子科技大學碩士學位論文語音保密通信的研究和實現(xiàn)姓名：殷滿崗申請學位級別：碩士專業(yè)：電子與通信工程指導教師：周建欽201106杭州電子科技大學碩士學位論文ABSTRACTIntoday’SNetworktime，Internetphonehasbeenwidelyappliedtovariousfieldsofsociety，foritsfeaturesofcheapandconvenientrealtimeSotosomeexte

2、ntitreplacedthetraditional6xedtelephoneandmobilephoneButitsvoiceanddataexchan舀ngbasedonnetworkSodatasecuritymustbeconsidered，suchas：networkeavesdropping，voiceChangerdisguise，andSOonInthisthesis，aresearchwasmadeonthesecur

3、ityproblemofvoicecommunicationsontheinternet，andapracticalpointtopointcallwassimulatedinthelocalareanetworkThedataencryptionanddecryptionprocesswasputintothevoicecommunicationprocess，SOastoachievethepurposeofconfidential

4、ityThemainworkandinnovationsareasfollows：1LearningontheaudiocontrolsofDirect)(andDirectXDirectSoundInthewayofreducingthevoicebufferareabyhalftheimitatedvoicesignalWaSrecordedintothedigitalsignalwiththePCMformatfromanalog

5、signal，whichcompletedtheA／Dtransformandgetreadyfordataencryptionanddecryption2AtthesametimeencryptionanddecryptionalgorithmwastestedscreeningItWaSconcludedthatonlythesequencecodeCanfinishtheencryptionanddecryptionintimef

6、orvoice3Thefollowingarethreestreamciphersusedforencryptionanddecryptionofvoicedatainthethesis：1)WhenstudyinganddesigningtheA5algorithmofthesequencecodewhichisusedinGSMsystemsomeimprovementwasmadeonmeA5algorithmincreasing

7、thenumberoftheprogressionofeachsub—registerandthenumberofthetappingsequenceSOastoresisttheexhaustiveattacktotheoriginalA5effectivelyontheprincipleofnochangingtheencryptionefficiency21Akindofsimpleselfsynchronizationseque

8、ncecodewasdesignedifthedataislost，itwillstepoutsomenumericaldecryption，andautomaticallyresumetothedecryptioncorrectlyThisalgorithmhashighnonlinearityandresiststheexhaustiveattacksuccessfully3)Inordertogettheexpandingsecr

9、etkeyalgorithmwithstablecycleandlinearcomplexityagainanewexpandingsecretkeyalgorithmwhichadoptstheideaofcourseinterlacingcontrolwasdesignedAftertestingthisalgorithmpseudorandomlythecalculateddataprovedthatthisalgorithmha

10、sgreatperiodicitystablelinearcomplexitywhichincreasesexponentiallyandsufficientrandomicityComparedtothetraditionalclockdrivecontrol，thisalgorithmCannotonlyresisttheexhaustiveattack，butalsoCanresistsimilarattackstotheGeff