期刊名称：Journal of Wireless Mobile Networks, Ubiquitous Computing, and Dependable Applications
印刷版ISSN：2093-5374
电子版ISSN：2093-5382
出版年度：2012
卷号：3
期号：1-2
页码：30-54
出版社：Innovative Information Science & Technology Research Group
摘要：Certificateless cryptosystem is a hybrid scheme of traditional PKI and ID-based scheme and haspositive aspects of both of PKI and ID-based cryptosystem, i.e. solving key escrow problem and certificatemanagement problem simultaneously. Cryptographic schemes constructed in such a hybridsetting, generally called certificateless setting, retain these positive aspects and have been extensivelystudied recently. To the best of our knowledge, an ordered sequential aggregate signature (OSAS)scheme, which is a signature scheme verifying both the validity of a document and a signing orderof a group of signers, has never been proposed in the certificateless setting. Therefore we propose anOSAS scheme in a certificateless setting called certificateless ordered sequential aggregate signature(CLOSAS) scheme. Our proposed scheme has advantages in its communication cost and the securityproof. In particular, its signature size is fixed with respect to the number of signers, and the securityis proven in the random oracle model against super adversaries that are the strongest adversary incertificateless signature scheme. Our scheme resists KGC’s malicious activities associated with keyescrow and forgery of signatures as long as both of each user and KGC involve directly in a keygeneration.
关键词：Key escrow problem; certificateless setting; ordered sequential aggregate signature scheme;super adversary; random oracle model; full aggregation
