| Summary: | 碩士 === 雲林科技大學 === 電機工程系碩士班 === 98 === As wireless communication technology progresses rapidly, more and more wireless Local Area Networks (LANs) have been deployed as a mainstream connectivity solution for a broad range of users nowadays. While wireless LANs provide users in public venues such as campuses or enterprises with convenient access to the Internet, how to assure users of secure fast handoff support remains an important issue. When handoff occurs, i.e., a station switches its radio link to different access points (APs), reauthentication and re-association procedures with new APs account for temporary disconnections from the network, causing packet loss and communication disruption. To mitigate such ill effects, IEEE 802.11F specifies the Inter Access Point Protocol (IAPP) with a set of service primitives for information exchanges among APs. On the other hand,IEEE 802.11r enacts a new authentication protocol, another new key management mechanism, and faster access to PTK (Pairwise Transient Key) along with resources reservation before re-association. In view that both IEEE 802.11F and IEEE 802.11r provide means to effect secure fast handoff, this thesis discusses how and why they work in practice. On the basis of these two standards, some related work with new treatment is highlighted as well.
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