Mobile IP protocol (MIP) enables the Mobile Node (MN) to
move around without loosing their transport-layer connectivity by using
resources in the foreign domain network. MIP is currently a hot research
area and expected to be the core infrastructure of future mobile
communication. However, a certain level of security services must be
provided before the wide deployment of MIP. Security services, such as
authentication and access control of the MN, have been considered since
the birth of MIP. But little attention has been given to location
privacy service, i.e. preventing the tracing of mobile user's point of
attachment to the network, despite of their increased significance in
wireless network. The disclosure of a MN's location and identity allows
unauthorized entities to track down his moving history, which can be a
serious violation of privacy. We identify required level of location
privacy, and propose an efficient protocol for providing the identified
level of location privacy. We also examine that this protocol is
compatible with current IPv6 and MIPv6 specifications.
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