Design of a Secure Framework Using Threshold Authentication and En-Route Filtering without the Third Party in VANETs

• Main Authors: Ya-Chen Tsai, 蔡亞宸
• Other Authors: Huei-Wen Ferng
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/67408105447036238508

碩士 === 國立臺灣科技大學 === 資訊工程系 === 104 === The security issue is one of important issues in vehicular ad hoc networks (VANETs). To ensure the security of VANETs, most researches assumed that a third party or a basic infrastructure exists and vehicles can communicate with the certificate authority via road side units. However, the third party may not exist or has been attacked or even compromised by the attackers within the communication range of the vehicles. In this thesis, we propose a secure cluster-based framework without the third party in VANETs. The proposed framework adopts some concepts of PCREF [1] to enable the polynomial-based threshold authentication and en-route filtering scheme, reaching the security without the third party. In addition, we propose another improved secure framework by employing the concept of trust values for vehicles and updating of keys to enhance the security of the framework. We then analyze the performance in terms of overhead of storage, computation, communication as well as security strength regarding confidentiality, data authenticity, data availability, and expected filtering position of the bogus report. Through the performance and security strength analyses, we conclude that the improved framework proposed in this thesis enhances the security of VANETs greatly without an unbearable cost.