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A broadcast encryption scheme enables a center to distribute keys and/or broadcast a message in a secure way over an insecure channel to an arbitrary subset of privileged recipients. In this paper, an ID-based broadcast encryption scheme is proposed, by which a center can distribute keys over a network, so that each member of a privileged subset of users(More)
Xinjun Du, Ying Wang, Jianhua Ge and Yumin Wang Key Laboratory of Computer Networks and Information Security Xidian University Xi’an 710071, P.R. China Abstract: This paper proposes an ID-based authenticated two round multi-party key agreement among n parties. Several ID-based two-party and tripartite key agreement schemes were proposed recently. Rana Barua(More)
Xinjun Du, Ying Wang, Jianhua Ge and Yumin Wang Key Laboratory of Computer Networks and Information Security Xidian University Xi’an 710071, P.R. China Abstract. Authenticated group key agreement problem is important in many modern collaborative and distributed applications. There are two ID-based authenticated group key agreement schemes have been proposed(More)
We propose short group signature (GS) schemes which are provably secure without random oracles. Our basic scheme is about 14 times shorter than the Boyen-Waters GS scheme at Eurocrypt 2006, and 42% shorter than the recent GS schemes due to Ateniese et al. The security proofs are provided in the Universally Composable model, which allows the proofs of(More)
As low-cost tags based on the EPC C-1 G-2 standard are much limited in storage capacity and computation power, most of the existing authentication protocols are too complicated to be suitable for these tags, and the design of authentication protocols conforming to the EPC C-1 G-2 standard is a big challenge. Recently, a mutual authentication protocol for(More)
Blackmailing may be the most serious drawback of the known electronic cash systems offering unconditional anonymity. Recently, D.Kugler proposed an on-line payment system without trusted party to prevent blackmailing based on the idea of marking. In this paper, some disadvantages of D.Kugler’s scheme are analyzed and then a new online electronic cash scheme(More)