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新的基于身份无可信中心的盲签名和代理签名
Title:NewAdvancesinIdentity-basedTrustlessBlindSignaturesandProxySignatures
Introduction:
Blindsignaturesandproxysignaturesarefundamentalcryptographicprimitivesthatenableprivacy-preservingtransactionsanddelegationofsigningauthority.Traditionally,bothoftheseschemesrelyontheusageoftrustedthirdpartiesascentralentities,whichcanintroducevulnerabilitiesandsinglepointsoffailure.Inrecentyears,therehavebeensignificantadvancementsincreatingidentity-basedtrustlessblindsignaturesandproxysignatures,offeringenhancedsecurity,privacy,andefficiencywithouttheneedforacentraltrustedauthority.Thispaperaimstodiscussthesenewdevelopments,analyzetheirproperties,andhighlighttheirpotentialapplications.
1.TrustlessBlindSignatures:
1.1DefinitionandPurpose:
-Provideunforgeabilityandunlinkability,enablingausertoobtainasignatureonamessagewithoutthesignerlearningthemessage'scontent.
-Ensuresigner'sabilitytodenyhavingsignedaspecificblindedmessage.
1.2TraditionalApproaches:
-Trustedthirdparty:Traditionalblindsignaturesinvolveacentralpartytrustedbyboththesignerandtheuser.Thisintroducesacentralpointoffailureandpotentialprivacyconcerns.
1.3NewAdvances:
-Identity-basedblindsignatures:Leveragingtheconceptofidentity-basedcryptography,theseschemeseliminatetheneedforatrustedthirdparty.Theuser'spublickeyisderivedfromtheiridentity,removingthecomplexityofcertificatemanagement.
-Zero-knowledgeproofs:Buildinguponidentity-basedblindsignatures,zero-knowledgeproofsaddanextralayerofprivacybyensuringthatthesignerlearnsnothingabouttheblindmessage.
1.4Applications:
-Anonymouselectroniccashsystems:Trustlessblindsignaturescanbeusedtoimplementdigitalcashsystems,enablingsecureandprivatedigitaltransactions.
2.TrustlessProxySignatures:
2.1DefinitionandPurpose:
-Enableauthorizedentitiestodelegatesigningrightstootherswithoutrevealingtheirprivatekeys.
-Preserveaccountabilitybyallowingtheverifiertoverifyboththesigner'sidentityandthedelegator'sauthorization.
2.2TraditionalApproaches:
-Trustedthirdparty:Traditi