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An Enhanced Cluster-tree Routing Algorithm in ZigB
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The ZigBee tree routing is widely used in many
resource-limited devices and applications, since it does not require any
routing table and route discovery overhead to send a packet to the destination.
However, the ZigBee tree routing has the fundamental limitation that a packet
follows the tree topology; thus, it cannot provide the optimal routing path. In
this paper, we propose the shortcut tree routing (STR) protocol that provides
the near optimal routing path as well as maintains the advantages of the ZigBee
tree routing such as no route discovery overhead and low memory consumption.
The main idea of the shortcut tree routing is to calculate remaining hops from
an arbitrary source to the destination using the hierarchical addressing scheme
in ZigBee, and each source or intermediate node forwards a packet to the
neighbor node with the smallest remaining hops in its neighbor table.
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Enhance Approach for Message Authentication and so
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INTRODUCTION Message Authentication is one of the most effective ways to thwart unauthorized and corrupted messages from being forwarded in wireless networks. For this reason, many message authentication schemes havebeen developed, based on either symmetric-key cryptosystems orpublic-key crypto systems. Most of them, however, have the limitationsof high computational and communication overhead in addition to lackof scalability and resilience to node compromise attacks. To addressthese issues, a polynomial-based scheme was recently introduced.However, this scheme and its extensions all have the weakness of abuilt-in threshold determined by the degree of the polynomial whenthe number of messages transmitted is larger than this threshold, theadversary can fully recover the
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introduction The migration to wireless network from wired network has been aglobal trend in the past few decades. The mobility and scalabilitybrought by wireless network made it possible in many applications.Among all the contemporary wireless networks, Mobile Ad hoc Network(MANET) is one of
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