Insider impersonation-MIM attack to tripartite key agreement scheme and an efficient protocol for multiple keys

Abstract

In this paper, we introduce the definition of insider impersonation-MIM attack for tripartite key agreement schemes and show that almost all of the proposed schemes are not secure under this attack. We present a new protocol which is much more efficient than the existential secure protocol [13] in terms of computational efficiency and transmitted data size. Moreover, our protocol is the first scheme for multiple keys which means that not only a large number of keys but also various kinds of keys can be generated by applying our scheme. © Springer-Verlag Berlin Heidelberg 2005.