Abstract
In wireless networks, secure multicast protocols are
difficult to implement efficiently due to the dynamic nature of the
multicast group and scarcity of bandwidth at the receiving and
transmitting ends. Mobility is one of the most distinct features to
be considered in a wireless network. Moving users onto the key
tree causes extra key management resources even though they
are still in service. To take care of frequent handoff between
wireless access networks, it is necessary to reduce the number of
rekeying messages and the size of the messages. In this paper, we
design a key management tree such that neighbors on the key tree
are also physical neighbors on the cellular network. By tracking
the user location, we localize the delivery of rekeying messages
to the users who need them. This lessens the amount of traffic
in wireless and wired intervals of the network. The group key
management scheme uses a pre-positioned secret sharing scheme.
