在無線隨意網路上基於可自我驗證簽名系統的安全的群組金鑰協議協定

Abstract

群組金鑰協議協定能讓一個群組中的參與者合作建立一個可在開放網路環境中加密或解密訊息的對話金鑰。在本論文中我們提出了一個基於可自我驗證簽名系統，可適用於無線行動隨意網路上的安全的群組金鑰協議協定。在DDH假設下，此協定可抵抗被動的攻擊者。而在random oracle模型與DL假設下，此協定可抵抗主動的攻擊者。此外，我們設計的協定還提供了向前安全性以及能夠抵抗已知金鑰的攻擊。

A group key agreement protocol allows participants to cooperatively establish a common session key which is used to encrypt or decrypt transmitted messages among them over an open network environment. In this paper we propose a secure group key agreement protocol based on the self-certified signature scheme which is suitable for the mobile ad hoc network environment. Under the DDH assumption, the proposed protocol is demonstrated to be secure against passive adversaries. Under the random oracle model and DL assumption, the proposed protocol is demonstrated to be secure against active adversaries. Besides, our protocol provides forward secrecy and withstands known-key attacks.