Privacy-Preserved Key Agreement and Hierarchical Conference Key Distribution Protocols with User Authentication from Pairings

• Main Authors: Chu Chih-Wei, 朱志偉
• Other Authors: 許建隆
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/75214608248583788202

碩士 === 長庚大學 === 資訊管理研究所 === 98 === With the progress of information technology, the computer crimes are emerging in an endless stream. It is because of the user’s privacy should be protected, when the user submit a service request to the service provider, both of them should check the identity of the other, and then build a shared key to accomplish the service request. Furthermore, when a conference is held, the chairman must verify the identities of all participants; afterwards, the chairman chooses a conference key and distributes it to legitimate participants. Besides, the participants should know who is in the conference. These prevent the malicious adversary from eavesdropping or impersonating to get some benefits. From the above point of view, and consideration of the security and performance in the system, we adopt the identity-based cryptosystem and the elliptic curve cryptosystem to design our protocols. Since the protocols have shorter key size, lower costs of management the keys, and lower costs of transformation, they are suitable for applying in various platforms, such as the smart card, mobile phone, and other lower storage devices. In this thesis, there are three distinct types of protocol: privacy-preserved identification protocol with key agreement, privacy-preserved conference key distribution protocol, and hierarchical conference key distribution protocols preserving user privacy to satisfy different communication environments.