有指定秘书的_t_n_门限群签名体制(5)

收者只需一次验证即可确定群签名的有效性而且是DC发布的;(2)系统更新时,无须更改每个成员的子密钥;(3)成员的增加或删除不影响群中其他的成员;(4)群中成员的子密钥可以无限制的使用;(5)t个成员合谋无法假冒其他成员生成有效的群签名Ζ所以,本方案可以应用于电子商务和网络安全通信等方面Ζ

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A(t,n)thresholdgroupsignatureschemewithdesignatedclerk

XIEQi,YUXiu2yuan12

(1.Dept.ofMath.,ZhejiangUniv.,Hangzhou310027,China;SchoolofInformationandEngineering,HangzhouTeachersCollege,Hangzhou310012,China;2.Dept.ofMath.,HangzhouTeachersCollege,

Hangzhou310012,China;Dept.ofMath.andPhys.,QuzhouCollege,Quzhou324000,China)Abstract:A(t,n)thresholdgroupsignatureschemewithtraceabilitybasedondesignatedclerkisproposed.Themainmeritsarethattheverificationofthegroupsignatureisefficient,itneedsnottorenewthemembers’shadowswhenthesystem

.Inaddition,anytmemberscannotrenewed,andallmemberscanreusetheirshadows

impersonateanothersetofgroupmemberstosignanymessage.

KeyWords:digitalsignature;thresholdgroupsignature;designatedclerk

MRSubjectClassification:11T71