(专业介绍-信息安全)

InformationSecurityFeb.27.2012SchoolofMathematicsProfessionintroduction———•DuringthistimewhentheInternetprovidesessentialcommunicationamongbillionsofpeopleandisbeingincreasinglyusedasatoolforcommerce,informationsecuritybecomesaprettyimportantissuetodealwith.Introduction--developmentIntroduction--resourcesIntroduction—expertsinthisfieldAdiShamirAdiShamir(bornJuly6,1952)isafamouscryptographer.Heisaco-inventoroftheRSAalgorithm,heinventeddifferentialcryptanalysisandhasmadenumerouscontributionstothefieldsofcryptographyandcomputerscience.Introduction—expertsinthisfieldWangXiaoyunWangXiaoyun,ProfessorofShandongUniversity,famouscryptographer.ShebrokethefamousciphersMD5,SHA-1,MD4andRIPEMDin2004and2005respectively.•Informationsecurityaimstoprotect◆Privacy◆Integrity◆Availability◆Authenticity◆Non-repudiationIntroduction—target•Therearemanyaspectsofinformationsecurity,rangingfromsecurecommerceandpaymentstoprivatecommunicationsandprotectingpasswords.•Therearetwomainaspectsintheinformationsecurityspecialty.◆NetworkSecurity◆CryptographyIntroduction--contentCryptography•Cryptographyisamajorsecurityandconfidentialityofcommunicationsdisciplines,anditincludestwobranches:theciphercodeandcipheranalysis.Encryption,KeyPlaintextCiphertextDecryption,KeyCryptography--show-how•Threetypesofcryptography:◆Secretkeycryptography◆Publickeycryptography◆HashfunctionCryptography--TypesCryptography--Types•Thesafetyofthecryptographyisbasedonseveraldifficultmathematicalproblems.Theseproblemswon’tbesolvedinalongtime,andthat’swhytheyarecalleddifficultproblems.Cryptography--theSafetyGuarantee•Cryptanalysissometimescangettheideahowthetextisencrypted,butnevergetthesecretkeyintheencryption.•TheHashFunctionisirreversible，whichmeansit’simpossibletogetbacktotheinputthroughtheoutput.Cryptography--theSafetyGuarantee•Actasthecryptanalysistobreakthecryptographysystemstofindoutwhethertheencryptionissafeenough.•Improvethesafetyofthecryptographysystemwithoutincreasingthecomplexityoftheencryptionalgorithm.WhatwedoCryptography--reference://tech.sina.com.cn/d/2006-12-22/07571301237.shtml=2273&boardid=1401