A Study of User Authentication Protocols in Mobile Communication System

• Main Authors: Shih-Pin Chen, 陳世斌
• Other Authors: Gwo-Boa Horng
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/81235844231006228108

碩士 === 國立中興大學 === 資訊科學研究所 === 89 === Recently, with the development of computer and communication technology, the amount of wireless communication users has rapidly grown. Now we can communicate with other people at anytime, anywhere. In the future, people will more and more rely on this technology. As we enjoy this convenience, we should notice that the transmission media is radio channel. And the radio channel is vulnerable to eavesdropping by unauthorized users. How to prevent illegal users from passive eavesdropping and active tampering is an emergent topic. There are many authentication protocols based on public key cryptography. Some use heavy computations and some are not secure enough. In this thesis, we introduce several protocols based on public key cryptography. We found there is a secure flaw in Park’s protocol, which will allow an attacker to masquerade the base station. An revised protocol is proposed. To enhance Park’s protocol, we use two different ways to authentication the two parties. One is Challenge─Response with server aided, and the other is similar to Schnorr’s Identification Scheme. They have the same properties as the original protocol yet they are more secure. Our new protocol provides mutual authentication and session key exchange. It also has offline authentication mechanism on the dynamic certificate and a secure end-to-end communication between two mobile users.