Multiple-key Agreement Protocol Research Articles

Security of authenticated multiple-key agreement protocols

Recently, Harn and Lin proposed an authenticated multiple-key agreement protocol that enables two parties to authenticate each other and to construct multiple common keys. Later, Yen and Joye claimed that the Harn-Lin scheme has a security weakness and proposed an improved version. Here the authors point out that the improved scheme still has the same weakness as does the original scheme.

Improved authenticated multiple-key agreement protocol

Recently, Harn and Lin (1998) developed a two-phase authenticated key agreement protocol which enables two parties to share multiple secret keys. The first phase of their protocol is the most important part and can be used to deliver a sequence of temporary random public keys to the other party in an authenticated approach. The authors demonstrate an improved version of this novel scheme after giving some cryptanalytic details of the original Harn-Lin scheme.