Cryptanalysis of Biswas's Multi-party Keys Scheme Based on the Diffie-Hellman Technique
Hsieh-Tsen Pan, Jia‐Rong Sun, Min‐Shiang Hwang · 2015
Biswas proposed two protocols based on the two-party Diffie-Hellman technique:(1) key agreement with multiple two-party keys and (2) a contributory group key exchange protocol.Then, Tseng and Wu pointed out that the second protocol has a security weakness and proposed a new protocol to remedy the weakness.In this paper, the authors point out that the Biswas's first protocol is vulnerable to a man-in-the-middle attack.Through the attack, an attacker can intercept, modify, or delete the communicated messages between two communicating party or among the group members.