To prevent misuse of privacy,numerous anonymous authentication schemes with linkability and/or traceability have been proposed to ensure different types of accountabilities.Previous schemes cannot simultaneously achie...To prevent misuse of privacy,numerous anonymous authentication schemes with linkability and/or traceability have been proposed to ensure different types of accountabilities.Previous schemes cannot simultaneously achieve public linking and tracing while holding access control,therefore,a new tool named linkable and traceable anonymous authentication with fine-grained access control(LTAA-FGAC)is offered,which is designed to satisfy:(i)access control,i.e.,only authorized users who meet a designated authentication policy are approved to authenticate messages;(ii)public linkability,i.e.,anyone can tell whether two authentications with respect to a common identifier are created by an identical user;(iii)public traceability,i.e.,everyone has the ability to deduce a double-authentication user’s identity from two linked authentications without the help of other parties.We formally define the basic security requirements for the new tool,and also give a generic construction so as to satisfy these requirements.Then,we present a formal security proof and an implementation of our proposed LTAA-FGAC scheme.展开更多
We introduce a new notion called accountable attribute-based authentication with fine-grained access control (AccABA), which achieves (i) fine-grained access control that prevents ineligible users from authenticating;...We introduce a new notion called accountable attribute-based authentication with fine-grained access control (AccABA), which achieves (i) fine-grained access control that prevents ineligible users from authenticating;(ii) anonymity such that no one can recognize the identity of a user;(iii) public accountability, i.e., as long as a user authenticates two different messages, the corresponding authentications will be easily identified and linked, and anyone can reveal the user’s identity without any help from a trusted third party. Then, we formalize the security requirements in terms of unforgeability, anonymity, linkability and traceability, and give a generic construction to fulfill these requirements. Based on AccABA, we further present the first attribute-based, fair, anonymous and publicly traceable crowdsourcing scheme on blockchain, which is designed to filter qualified workers to participate in tasks, and ensures the fairness of the competition between workers, and finally balances the tension between anonymity and accountability.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U2001205,61932010)Guangdong Basic and Applied Basic Research Foundation(Nos.2023B1515040020,2019B030302008)Guangdong Provincial Key Laboratory of Power System Network Security(No.GPKLPSNS-2022-KF-05).
文摘To prevent misuse of privacy,numerous anonymous authentication schemes with linkability and/or traceability have been proposed to ensure different types of accountabilities.Previous schemes cannot simultaneously achieve public linking and tracing while holding access control,therefore,a new tool named linkable and traceable anonymous authentication with fine-grained access control(LTAA-FGAC)is offered,which is designed to satisfy:(i)access control,i.e.,only authorized users who meet a designated authentication policy are approved to authenticate messages;(ii)public linkability,i.e.,anyone can tell whether two authentications with respect to a common identifier are created by an identical user;(iii)public traceability,i.e.,everyone has the ability to deduce a double-authentication user’s identity from two linked authentications without the help of other parties.We formally define the basic security requirements for the new tool,and also give a generic construction so as to satisfy these requirements.Then,we present a formal security proof and an implementation of our proposed LTAA-FGAC scheme.
基金supported by the National Natural Science Foundation of China(Grant Nos.U2001205,61922036,61932011)Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2019B030302008,2019B1515120010)+2 种基金Science and Technology Project of Guangzhou City(Grant No.201707010320)TESTBED2(Grant No.H2020-MSCA-RISE-2019)National Key Research and Development Program of China(Grant No.2019YFE0123600).
文摘We introduce a new notion called accountable attribute-based authentication with fine-grained access control (AccABA), which achieves (i) fine-grained access control that prevents ineligible users from authenticating;(ii) anonymity such that no one can recognize the identity of a user;(iii) public accountability, i.e., as long as a user authenticates two different messages, the corresponding authentications will be easily identified and linked, and anyone can reveal the user’s identity without any help from a trusted third party. Then, we formalize the security requirements in terms of unforgeability, anonymity, linkability and traceability, and give a generic construction to fulfill these requirements. Based on AccABA, we further present the first attribute-based, fair, anonymous and publicly traceable crowdsourcing scheme on blockchain, which is designed to filter qualified workers to participate in tasks, and ensures the fairness of the competition between workers, and finally balances the tension between anonymity and accountability.
