ID-based Tripartite Multiple Key Agreement Protocol Facilitating Computer Auditing and Transaction Refereeing
Hung‐Yu Chien · 2006
Computer auditing and transaction refereeing require the system to keep genuine records. However, it is difficult for an auditor or a referee to on-line audit the contents or involve in the communication while the communication is kept confidential from others. This problem has a promising solution, when Joux proposed the first efficient tripartite key agreement protocol that enables three parties (that might include one referee) to establish a secure session key. However, several published schemes are not secure. This paper examines the weaknesses, and then proposes an ID-based tripartite multiple key agreement protocol to raise the level of security and improve the efficiency. The security is proved in a modified Bellare-Pointcheval-Rogaway model.