CAJ | 학술논문

针对Camenisch-Stadler群签名方案中无法撤销成员的问题，提出了一种有效的群成员撤销方案，该方案可以灵活地增加和撤销群成员。当成员加入时，群主管向其颁发成员证书，其他成员无需更新成员密钥和证书；当成员撤销时，群主管只需将撤销成员的匿名身份更新到撤销列表中，无需更新群密钥和其他成员证书，且签名长度与验证工作量均独立于群成员和已撤销成员的个数。因此，新方案适用于群成员数较多和成员更新比较频繁的群签名。
침대Camenisch-Stadler군첨명방안중무법철소성원적문제，제출료일충유효적군성원철소방안，해방안가이령활지증가화철소군성원。당성원가입시，군주관향기반발성원증서，기타성원무수경신성원밀약화증서；당성원철소시，군주관지수장철소성원적닉명신빈경신도철소렬표중，무수경신군밀약화기타성원증서，차첨명장도여험증공작량균독립우군성원화이철소성원적개수。인차，신방안괄용우군성원수교다화성원경신비교빈번적군첨명。
In order to solve the problem that Camenisch-Stadler’s group signature scheme could not revoke members, a new revocation scheme based on the Camenisch-Stadler’s group scheme was proposed, allowing the group manager to add new members or revoke old members flexibly and freely. When a member joins the group, the group manager issues member certificate to him (her), and other members need not update the key and certificate;when a member is revoked, the group manager only adds the anonymous identity to revocation list, and other members need not update the key and certificate either. Furthermore, the length of the signature and the computational effort are independent of the number of the group members and the revoked members, so the new scheme is more suitable for large group and the group with members’ heavy updates.