隨著行動通訊技術的進步，行動用戶可以不受時間與地理因素限制，經由行動裝置存取漫遊服務。然而近來資訊外洩日益嚴重，因此在開放的通訊網路上達成所需之安全鑑別與隱私保護乃為發展漫遊服務的重要碁石。綜觀現行的匿名鑑別機制，將導致行動用戶必須儲存大量的憑證才能向所有外網服務代理者存取服務。本論文提出適用於全球行動網路漫遊服務之時限性匿名鑑別機制，行動用戶只需持有單一符記即可在有效期間與所有外網服務代理者進行身分驗證並存取服務，不僅可減少行動用戶儲存大量憑證，降低行動裝置的儲存成本，更能提升漫遊服務的效率。

As the development of mobile communication grows rapidly, people can access the roaming service by mobile devices anytime and anywhere in the world. The privacy protection and security problems in an open communication network have become an important issue. However, mobile users have to store massive credentials to access these services provided by all foreign agents. This thesis developed a time-bound anonymous authentication mechanism for roaming service in global mobility networks. It is based on an ellipse curve cryptosystem and self-certified public key system. Thus, each mobile user can use only a single token to access the services provided by all foreign agents in the period of time-bound with unlimited times and progress self-certification. It not only reduces the communication and storage costs but also improves the performance of accessing.

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