Disclosed is a method for fast handover in a wireless security data
communication environment. The fast handover method for a mobile node
connected to a network via an access point to perform a data
communication in a wireless communication environment according to the
present invention includes: performing an authentication while
communicating with an authentication server having registration
information about the mobile node via an uncontrolled port of the access
point so as to make the mobile node connected to the network; performing
a mobile Internet Protocol (IP) registration for binding a
Care-of-Address (CoA) to a home agent and a correspondent node (CN) via
the access point in parallel with performing the authentication; and
opening a control port of the access point and relaying data transceived
at the mobile node using the CoA when the authentication and the
registration being successfully completed. Accordingly, a fast handover
of the mobile node can be supported.