Improved authenticated multiple-key agreement protocol without using conventional one-way function

An authenticated multiple-key agreement protocol enables two entities to authenticate each other and establish multiple common keys in a two-pass interaction, and a protocol without using a conventional hash function simplifies its security assumption on only public hard problem. In 2001, Yen el al. proposed an improved multiple-key agreement protocol to overcome the attacks that break the previous variants. However, the authors show that an impersonator can easily forge message without being detected, and can establish common session keys with the communicating party. To overcome all the weakness, we propose an improved scheme that also achieves better key utilization, compared to the previous variants. (C) 2002 Elsevier Inc. All rights reserved.