Security is of critical importance for many potential applications of wireless sensor networks. In order to maintain
secure communication throughout the network, it is of vital importance to maintain encryption key freshness by
regularly distributing new keys to all nodes. Distribution of group keys used to encrypt broadcast communication
is expensive, as it is generally achieved via flooding, which taxes the limited battery life available to each node.
We propose LKDT, a lightweight encryption key distribution tree building mechanism with an optional Multi-
Coverage Reduction (MCR) stage to provide a framework by which to distribute keys while reducing power
consumption and broadcast coverage overlap. Additionally, LKDT can configure itself quickly, allowing the base
station to begin updating keys shortly after deployment.
Mobile ad hoc network (MANET) is a radio packet network without dedicated infrastructures. In recent years it has
received tremendous attention because of its self-configuration and self-maintenance capabilities. However, because of
node mobility and shared wireless links, its routing protocol design presents nontrivial challenges such as broadcast storm,
stale route and delay. This paper proposes a location-based route self-recovery technique for source-initiated routing
protocols. The purpose of route self-recovery is to reduce overhead and delay during route maintenance as well as allowing
continuous packet forwarding for fault resilience. The ns-2 based simulation shows throughput and overhead improvements
of source-initiated routing with route self-recovery and in the case of highly dynamic environments and heavy traffic loads,
it is more robust and scalable than other protocols.
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