一個針對衛星通訊的彈性存取控制演算法

Abstract

隨著無線網路與行動通訊的出現，使得在此架構下的應用需求不斷增加。尤其在國際電信聯盟所制定的IMT-2000規範完成後，提供陸上與衛星兩種傳輸媒介，更使得IMT-2000無論在便利性與傳輸速度的考量上都具備優勢。在無線網路其中以衛星通訊的使用，最具潛力及發展性。然而，由於訊號在空氣中傳播，資料安全性與保密性也受到考驗。因此，資訊安全機制之研究，將是未來無線網路中重要且急需解決的問題。而在本論文中，我們將探討衛星通訊環境中存取控制機制，有效率的存取控制機制可使得通過授權的使用者存取所被授予權限範圍內的資料，如此，可以防止非法或是雖經授權但無相關權限存取的合法使用者存取資源。在本論文中我們透過實作證明我們的演算法能有效的指派使用者所需權限，使系統不但能保證各項資源的安全性，亦能兼顧本身之彈性。

Due to the growth of the wireless technologies, the application requirements constantly increase under the wireless network architecture. The IMT2000, issued by ITU, provides territory and satellite transmission media for mobile communications and, thus, it stands an advantageous position in terms of convenience and speed. It has more potentiality and development. However, data security and confidentiality are threatened due to data transmission on the air. Hence, the study of secure schemes is an important issue in the wireless network environment. Access control is one of the most important parts of satellite communication, and it enforces users that are restricted to access authorized activities according to the authorization plan. Consequently, illegal users or legal users with illegal access right can be prevented to ensure the security of the system. In our research, we have implemented our algorithm and proved that it protects every resource in the system effectively, and it makes the system more flexible, too.