| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 93 === Abstract
In this thesis, we propose a new authentication mechanism for Mobile IP based on hierarchy structure to improve handoff problem. We use the hierarchy structure and cryptography concept to reach our purpose. The proposed new mechanism not only improves handoff of Mobile IP to reduce packet loss and transmission delay but also to attain safe authentication.
The proposed authentication protocol on hierarchical structure can be divided into two parts. The first part is called as home registration protocol and the second is micro-mobility registration protocol. At first, when MN(Mobile Node) moves from its home network to a visited foreign network, it has to perform the home registration protocol. In home registration protocol, MN sends its registration request through a designed two-level hierarchical structure to its home network. The HA(Home Agent) gives MN a registration reply with a ticket for the authentication of the micro-mobility registration. On order to avoid the handoff problems occurs in Mobile IP when MN changes its FA(Foreign Agent) to another FA, it needs not to register HA again. On the contrast, the thing for MN to do is to forward the ticket given by HA to the CFA(Common Foreign Agent) on the first level of hierarchical structure. In the mean time, CFA updates the ticket from HA and sends it to MN for the next time micro-mobility registration. On our proposal, the symmetric cryptography is used to make a secure communication for the proposed protocol.
The contributions of our main purpose are as follows：
(1)The feature of our schemes is that new ticket mechanism is used to alleviate the overhead of home registration caused by frequently local handoff and reduce data loss.
(2)When MN is moving within the same domain of a CFA, MN is not required to perform the home registration with HA to shorten the register time.
(3)Our proposed protocol can attain safe authentication to prevent various attacks.
According to our proposal, it is believed that the results of our method in this thesis is much helpful to future research and application in frequent handoffs in Mobile IP environment.
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