Asymmetric Group Key Agreement

14 years 6 months ago
Asymmetric Group Key Agreement
A group key agreement (GKA) protocol allows a set of users to establish a common secret via open networks. Observing that a major goal of GKAs for most applications is to establish a confidential channel among group members, we revisit the group key agreement definition and distinguish the conventional (symmetric) group key agreement from asymmetric group key agreement (ASGKA) protocols. Instead of a common secret key, only a shared encryption key is negotiated in an ASGKA protocol. This encryption key is accessible to attackers and corresponds to different decryption keys, each of which is only computable by one group member. We propose a generic construction of one-round ASGKAs based on a new primitive referred to as aggregatable signaturebased broadcast (ASBB), in which the public key can be simultaneously used to verify signatures and encrypt messages while any signature can be used to decrypt ciphertexts under this public key. Using bilinear pairings, we realize an efficient ASBB ...
Qianhong Wu, Yi Mu, Willy Susilo, Bo Qin, Josep Do
Added 24 Nov 2009
Updated 24 Nov 2009
Type Conference
Year 2009
Authors Qianhong Wu, Yi Mu, Willy Susilo, Bo Qin, Josep Domingo-Ferrer
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