Abstract
We present the Secure
SOurce-BAsed Loose Synchronization (SOBAS) protocol to securely synchronize the
events in the network, without the transmission of explicit synchronization
control messages. In SOBAS, nodes use their local time values as a onetime dynamic
key to encrypt each message. In this way, SOBAS provides an effective dynamic
en-route filtering mechanism, where the malicious data is filtered from the
network. With SOBAS, we are able to achieve our main goal of synchronizing
events at the sink as quickly, as accurately, and as surreptitiously as
possible. With loose synchronization, SOBAS reduces the number of control messages
needed for a WSN to operate providing the key benefits of reduced energy
consumption as well as reducing the opportunity for malicious nodes to
eavesdrop, intercept, or be made aware of the presence of the network. Albeit a
loose synchronization per se, SOBAS is also able to provide 7:24 [1]s
clock precision given today’s sensor technology, which is much better than
other comparable schemes (schemes that do not employ GPS devices). Also, we
show that by recognizing the need for and employing loose time synchronization,
necessary synchronization can be provided to the WSN application using half of
the energy needed for traditional schemes.
Both analytical and simulation results are presented to verify the feasibility
of SOBAS as well as the energy consumption of the scheme under normal operation
and attack from malicious nodes.
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