基于混沌理论的信息加密技术研究

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1、CI"分类号j旦垫!—L§&——单位代码—业dl＆学号业鳗皿业每彦交通戈肇硕士学位论文☆zⅢI】：基于混沌理论的信息加密技术研究——卫旦壁里坚旦堕卫生里坐幽上堕坐匝竺—一BasedonChaosTheory”J『％t№“嚣重主李建章副教授工学管理科学与工程2(109年3月27日重庆交通大学**女¨☆】jw-—』韭昌壹”Ⅻ^—_呈蝗遣L一池洁2009年3月ABSTRACTWiththerapiddevelopmentofinformationtechnologyandwidespreadapplicationofIntemet．moreandmoreinfor

2、mationistransmittedthroughthenetwork．Thesecurityofinformationisbecomingincreasinglyimportant．Cryptographyisthecoretechnologyandbasicmeanstoprotectinformationsecurity．Therefore，theresearchforvariousinformationencryptionalgorithmshasimportantpracticalsignificance．Asaphenomenonfoundin

3、non-lineardynamicsystem，chaoticsystemissensitivetoitsinitialconditionsandchaoticsequencegeneratedbyithasthecharacteristicofcomplexity,randomnessandisdifficulttoanalyzeandpredict．Thishascloserelationshiptocryptographicproperties．Thesecurityoftraditionalcryptologyatpresentisconf两nted

4、witllallsortsofmenaces，chaos—basedencryptionhasopenedanewwayofcryptologyandiswidelystudiedrecently．Firstly,basicconceptsanddefinitionsofchaosaredescribedsystematicfromchaoticdynamicaspect，themeasurementisdiscussedandtheapplicationofchaosininformationsecurityisintroduced．Then,thethe

5、oryandtechnologyofmodemcryptography,suchasprivatekeycryptosystem，publickeycryptosystemandhashfhrlction．areintroduced，therelationshipbetweenchaosandcryptographyiSinterpretedandsecurityofchaossequenceisanalyzed，especiallythebasicprinciples，methodsandcharacteristicsofstreamcipherareel

6、aborated．Acomprehensiveanalysisforlogisticchaoticsystemisconductedwiththecombinationoftheoreticalanalysisandmathematicalexperiment．Basedontheintroductionofsingle-typeLogisticchaoticsequencesencryptionalgorithmmethod，faultsarepointedoutandimprovedalgorithmisgiven，analysisandexperime

7、ntalresultsshowthattheimprovedalgorithmismoreeffectiveandsecure．Finally,Themainideaandconcreterealizationofatypeofalgorithmbasedonsearchingmechanismisintroduced，algorithmperformanceisanalyzed，disadvantagesispointedout，resultsshowthatithasbettersecurity．improvedalgorithmisgivenandsi

8、mulationKEYWORDS：Chaos，Cry