Certificateless Authenticated Group Key Agreement Schemes for Wireless Networks

• Main Authors: Chung-Fu Lu, 呂崇富
• Other Authors: Tzong-Chen Wu
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/75711830721696582276

博士 === 國立臺灣科技大學 === 資訊管理系 === 99 === Due to the vulnerable to eavesdropping and unbalance properties of the wireless environments, the security and privacy protection for group communication on the open wireless networks has become an increasing concern. This dissertation considers the subjects of group communication applications for wireless local area networks and mobile communication networks to propose secure and efficient authenticated group key agreement schemes. They can achieve the security requirements of mutual authentication, impersonation attack resistance, explicit key confirmation, and group key updating for group communications. This dissertation first presents a wireless authenticated group key agreement scheme (wAGKA) for general wireless networks. Then we propose a wireless authenticated group key agreement scheme with privacy-preservation (wAGKA-PP) based on the proposed wAGKA scheme. Elaborating on merits of the certificateless public keys and elliptic curve cryptography, the entity authentication and the authenticity of the intended public keys can be simultaneously verified in a logically single step without requiring any public key certificates. And, bit sizes of the keys and the related messages are relatively smaller than those of the previously proposed schemes for the same security level. They save the required communication overheads, and computational complexities. Furthermore, the proposed wAGKA-PP scheme provides the property of user anonymity. The proposed wAGKA and wAGKA-PP schemes are more secure and efficient than previously proposed schemes for general wireless networks. In order to implement the current group key agreement schemes into the UMTS, it needs to increase some extra security functions or modules to the existing UMTS framework but that is non-feasible. Hence, this dissertation proposes a UMTS authenticated group key agreement scheme (uAGKA) based on UMTS framework. The proposed uAGKA scheme can establish three types of secret keys shared by the participant users. One key is used for secure group communication and the other keys can be used for group key updating or subgroup applications. The proposed uAGKA scheme is compatible to UMTS architecture since it exploits only the existing UMTS security functions and exclusive-or (XOR) operation. And, it can achieve the lawful interception requirement and recommendations in existing UMTS standards.