Multiparty Authentication Services and Key Agreement Protocols with Semi-Trusted Third Party

• 作 者: 郑东 陈克非 尤晋元
• 机 构: Department of Computer Science and Engineering, Shanghai Jiaotong University Shanghai 200030, P.R. C
• 出 处: 计算机科学技术学报(英文版)
• 发表日期: 2002年6期
• 关键词: secure key establishment authentication group communication

This paper introduces a new family of group key establishment protocols suit-able for small or medium-sized groups. Five protocols are presented, using a semi-trustedserver, with varying security service. The first one is a non-authenticated key agreement pro-tocol suitable for applications with low security requirements. The second protocol adds anauthenticated key agreement to provide collaborative authentication. The third and the fourthprotocols provide key establishment with integrity and confirmation services, and the fifth pro-tocol is the member adding protocol. A major advantage of the protocols is that they reducethe numbers of rounds from n to 5.