Converting Group Key Agreement Protocol into Password-Based Setting - Case Study

Abstract— Converting a secure group key agreement protocol into password-based setting is not a trivial task. The security of a password-based scheme hinges on preventing dictionary attack that enables an adversary to take advantage of the low entropy of human memorable passwords. In this paper, we make a case study considering the constant round group key agreement protocol DB proposed by DuttaBarua, which is a simple variant of Burmester-Desmedt protocol BD. We present a simple and elegant contributory group key agreement in password-based setting derived from the protocol DB. We discuss several issues regarding the difficulties of converting this DB protocol into password-based setting. We have made several modifications in the protocol DB and then enhance it to password-based setting. The security of the proposed scheme against dictionary attacks is in the ideal cipher model under Decision Diffie-Hellman (DDH) assumption. We analyze our protocol in the security framework forma...

• Type: Journal
• Year: 2007
• Where: JCP
• Authors: Ratna Dutta
• Keywords: Group Key Agreement, JCP 2007, Key Agreement Protocol, Protocol Db