以第三公信者為基礎的秘密金匙分配與身份確認的密碼協定之設計

Abstract

秘密金匙分配與身份確認的密碼協定在網路安全的領域中是一項十分重要 的課題而因此一直被廣泛地研究.目前已經有許多該類的密碼協定在學術 界中被提出,每一個都有其本身獨特的設計.在本篇論文中,我們特別針對 利用第三公信者(the trusted server)來輔助設計的密碼協定做討論.我 們首先研究了幾個在學術界中已有的密碼協定,試著在討論的過程中,整理 出一些設計上的理念與分析要點.根據這些要點,我們可以組合出許多不同 的設計條件環境.最後我們便針對這些不同的環境而根據先前整理出的設 計理念來設計出適用的密碼協定,以提供一種系統化的分析及思考方向. Key distribution with authentication protocols are considered a very importanttopic in the network security and has been studied extensively. There are manyprotocols proposed to solve this problem and each has its own features. We focus on the protocols that use a third party, the trusted server, to achieve this work. We survey some of them to have some concepts and issues on the design of such protocols. Finally, we design protocols under different combinations of some design issues to form a systematic study on this topic.