密钥隔离数字签名的研究

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1、AbstractThisthesisintroducesthepresentsituationofkey—isolationmechanismandfindsthefollowingshortcomingsbyanalyzingthepresentkey-isolateddigitalsignatures：1．Nowmostkey-isolatedsignaturesareallsignalsignature，inotherwords，inthissystem，theuserparticipatingt

2、hesignoperationisonlyone，whichdoesn’tconsiderthatsometimestherearemanyuserswhowillsignthemessage．2．Mostoftheexistingidentity-basedkey·isolatedsignaturesallassumethatthekeyoftheperipheraldeviceisabsolutelysafeandinthesesystemsthereisonlyoneperipheraldevic

3、e，whichcannotmeettheactualdemand．Tosolvetheaboveproblems，thisthesisproposestwodifferentkey-isolatedsignaturesandhasfinishedthefollowingwork：1．Usingthekey-isolationmechanisminmultiplesignatures，astrong(f，N)key-isolatedsignatureisproposed．Thisschemenotonly

4、hasthecharacteristicofmultiplesignatures，butalsohastheadvantageofstrongkey-isolationsecurityandshortsignaturelength，whichCanmeetavarietyofpracticalapplicationswell．2．Thereisonlyoneperipheraldeviceintheadditionalidentity-basedkey-isolatedsignatures，SOthek

5、eyoftheperipheraldeviceiseasiertobeexposed．Consideringthis，thisthesisproposedanewscheme．Inthisscheme，thereale以diffixentandindependentperipheraldeviceswhichsharethekeyevolutionaryinformationbythewayof(七，靠)secretsharing．Anykofthese刀peripheraldevicescanhelp

6、theuserupdateitstemporaryprivatekey．Soeveniftheprivatekeyisupdatedfrequently，thisschemestillCanmaintainlowerkeyexposureprobabilityofperipheraldevices，whichenhancestheabilityofsystemresistingthekeyexposure．Keywords：keyexposure；key-isolation；multisignature

7、；secretsharing目录第一章引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1数字签名⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．2密钥隔离机制⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．3本文的研究意义和取得成果⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．4本文的组织⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯5第二章密码学⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．62．1私钥密码体制⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯62．2公钥

8、密码体制⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯72．3密码学在信息安全中的应用⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯92．4／J、结⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯10第三章密钥泄漏保护的相关工作⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯113．1密钥泄漏保护机制的研究⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．1l3．1．1分布式技术⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．1l3．1．