本文通采用BAN 逻辑对Otwa y-Rees 协议建立理想化协议模型 ,利用协议的初始假设 和BAN 逻辑的公设分析了Otway-Rees 协议的安全性。 关键词:安全协议;BAN 逻辑;OtwayRees 协议 Abstract: In this paper, BAN logic was used to construct an ideal model of the well known OtwayRees protocol. The security of the OtwayRees protocol was analyzed with the initial hypothesis and the logic postulate. Keywords: Cryptographic protocol; BAN logic; OtwayRees protocol