| Summary: | 碩士 === 世新大學 === 資訊管理學研究所(含碩專班) === 95 === Owing to the domestic Third Generation corporations established and
popularized by the telecommunication services, the opportunities for consumers to
use the telecommunication services with handset devices are increasing. Although
consumers enjoy the convenience of telecommunication services, they simultaneously
consider the invisible threat in mobile networks. In order to provide consumers with
secure and convenient telecommunication services, authentication plays a very
important role in the entire mobile network system, acting as the first defense against
the attackers since it can ensure the correctness of the identities of communication
entites before they engage in any other communication activities.
First, the mobile server must authenticate the mobile user, so the authorized
mobile user can access the relative services. On the other hand, the mobile user also
must authenticate the mobile server to achieve the security of mutual authentication.
Traditionally, using a registered password is used to achieve user identity
authentication, but this means of authentication is not robust and secure enough.
Consequently, this thesis argues for the use of key agreement to achieve
confidentiality and integrity in communication. Because traditional key agreement
uses the exponential calculation and the complex encryption algorithm, and based on
the restrictions and insufficiency of the computational ability of mobile device, the
thesis designs a user authentication protocol with fast and easy authentication and
absolute security. The thesis also consider the situation that mobile users roam to VLR
in different network domain without coming back to the registered HLR to apply for a
certificate, the mobile user apply for the certificate with the former roaming VLR,
thereby reducing the bandwidth consumption between VLR & HLR.
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