PKI培训海外(英文版).ppt
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1、1 1为了安全为了安全 总是握奇总是握奇2009年1月14日Security payment and trusted Security payment and trusted compute productions linecompute productions linePKI introduction2 2为了安全为了安全 总是握奇总是握奇ContentInformation Security BackgroundPKI FoundationA Whole PKI SystemStandards and reference3 3为了安全为了安全 总是握奇总是握奇the primary tar
2、get of the information securityassure the sender is himselfdefend the document be readed/writed without the authenticationdefend the amend for document without the authenticationsender dont denied the documentsthe arbitration authority4 4为了安全为了安全 总是握奇总是握奇the essence and countermeasure of the securit
3、y threatssecurity threatscountermeasuresLawlessly access system for operating documentsAccess control/operation controlWiretap the information or leakdocument encryptForgery transaction or deliver documentauthentication the documents sourcedocuments be sophisticated or deleteddocument integralitySen
4、der or receiver deny the documentsundeniable5 5为了安全为了安全 总是握奇总是握奇PKI(Public Key infrastructure)Public Key Infrastructure(PKI)Supply the solutions for the security of electronic world6 6为了安全为了安全 总是握奇总是握奇ContentInformation Security BackgroundPKI FoundationA Whole PKI SystemStandards and reference7 7为了安
5、全为了安全 总是握奇总是握奇PKI?InfrastructureInfrastructure based on Public Key Supply security basic architecture by public key principle and technology8 8为了安全为了安全 总是握奇总是握奇symmetrical Key encrypt/decrypt processtwo parts use the same key9 9为了安全为了安全 总是握奇总是握奇problems about the symmetrical Key manage the keys and
6、assure confidentiality are the important problems1010为了安全为了安全 总是握奇总是握奇public Key encrypt principlepublic Key encrypt(asymmetrical Key)a pair of keys(private Key and public key)instead of the symmetrical keysended information is encrypted by public key,receive part use the private key decrypt informa
7、tionpublic key may spread freely private and public key do the digital signature and validate the signatureAssure the integrality and authentication sender1111为了安全为了安全 总是握奇总是握奇asymmetrical key encrypt processone public key and one private key 1212为了安全为了安全 总是握奇总是握奇compare about two encrypt typessymme
8、trical keyasymmetrical keykey countsSingle key A pair of keys(private and public Keys)statementKey must secrecyA public key and a private keymanagementsimple and difficulty for management need digital certification and trusted third partencrypt velocityquicklyslowlyapplicationmass data informationsm
9、all data information1313为了安全为了安全 总是握奇总是握奇Digest arithmeticverify the information be not sophisticatedoutput result is computed by the digest arithmeticThe result have the same length,usually is 128 bits or 160 bits,now we have the 32*8 bits-different input,the same output-every bit does hashthe file
10、s with same hash results is impossibleAny change will have the different hash result1414为了安全为了安全 总是握奇总是握奇Digital Signature OperationDataMD5SHA1SHA2561515为了安全为了安全 总是握奇总是握奇Termssignatureprivate key encryptvalidate signaturepublic key decryptasymmetrical encryptpublic key encryptasymmetrical encrypt de
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