الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In Wireless Sensor Networks, nodes are microcontroller-based devices that are small in size
and low in cost. These nodes, also called motes, have limited resources in terms of energy,
computational capacity and wireless communication capabilities. Motes are deployed in an
environment to perform an application-specific task. For instance, vibration sensors may be
spread over a large structure like a bridge to collect information about it and relay it to a base
station.
Security of WSNs is an important issue in their operation, since motes are usually left to
operate unattended in the environment where they were deployed. This makes them
vulnerable to attacks from malicious intruders who may wish to read sensitive data being
transmitted or alter these data. Security mechanisms, therefore, need to be implemented in
order to protect the network. These mechanisms are meant to achieve security goals such as
the secrecy of a piece of communicated information or the authenticity of an agent‟s identity.
They rely on the design of security protocols that are meant to secure communication between
motes.
We focus on entity authentication protocols, where the goal is to verify the identities of motes
in the network. This is crucial for secure communication, since, without it, an intruder can
inject false data or interrupt network operation by introducing the intruder‟s own motes into
the network. We propose an authentication protocol for WSNs and show how it can be
executed as an integral part of a routing protocol. The authentication protocol is implemented
using the NesC programming language and the TinyOS operating system for motes.
Simulations of protocol execution are carried out using the TOSSIM simulator of WSNs