Group Key Agreement From Signcryption
Xixiang Lv · KSII Transactions on Internet and Information Systems · 2012
There is an intuitive connection between signcryption and key agreement.Such a connector may lead to a novel way to construct authenticated and efficient group key agreement protocols.In this paper, we present a primary approach for constructing an authenticated group key agreement protocol from signcryption.This approach introduces desired properties to group key agreement.What this means is that the signcryption gives assurance to a sender that the key is available only to the recipient, and assurance to the recipient that the key indeed comes from the sender.Following the generic construction, we instantiate a distributed two-round group key agreement protocol based on signcryption scheme given by Dent [8].We also show that this concrete protocol is secure in the outsider unforgeability notion and the outsider confidentiality notion assuming hardness of the Gap Diffie-Hellman problem.