Wimax (Worldwide Interoperability for Microwave Access) is a standard of wireless metropolitan area networks (WMAN), designed by IEEE 802.16 standards group. The coverage of Wimax is wide, so it is suited for developing in large networks and provides more steady, high-speed, and secure data transmission for fixed and mobile subscribers. As the result, Wimax is designed for solving last mile problem because of the bandwidth is limit and the expensive building cost in the traditional networks. IEEE 802.16 (Wimax) defines two modes of data communication topology: PMP (Point-to-multipoint) mode and Mesh mode. In Mesh mode, the data can route through another subscriber station (SS), so it not only improves coverage range but also raises the throughput. Although IEEE 802.16 defined a secure sub layer in the MAC (Media Access Control) layer to provide privacy by encrypting connections between base station (BS) and subscriber station (SS), but it still face many security problems. In the mesh mode, it is not like PMP mode that the traffic is only between BS and SS, the traffic sometime will pass through another SS, for this reason, it is prone to bring many problems, such as shared secret key exposing, man-in-the-middle attack, eavesdropping threat¡Ketc. On the relay node (we termed sponsor node here), it also involved more unnecessary loads of encryption and decryption. In this thesis, we focus on the MAC layer , and we propose some schemes to modify the present of PKM and the traffic encryption key used for transmitting data, and we will show that these schemes can achieve better security than previous ones, also achieve efficient in data transmission.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0715109-170428 |
| Date | 15 July 2009 |
| Creators | Shih, Yen-yu |
| Contributors | Lung-Jen Wang, Ming-Chao Chiang, Yi-Wu Chiang, Wen-Hsiung Hsieh, Bin-Yi Liao |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715109-170428 |
| Rights | not_available, Copyright information available at source archive |
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