Paper 2003/247

ID-based Authenticated Two Round Multi-Party Key Agreement

Xinjun Du and Ying Wang and Jianhua Ge and Yumin Wang

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. Our two round multi-party key agreement scheme utilizes the idea of the two-round group key exchange protocol of Burmester and Desmedt. The authenticity of the protocol is assured by a special signature scheme, so the messages carrying the information of ephemeral key can be broadcasted authentically by an entity. Security attributes of our protocol are presented, and computational overhead and band width of the broadcast messages are analyzed as well.

Note: the signature scheme can not provide the authenticity of the key agreement scheme.