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Mobile sinks (MSs) are vital in many wireless sensor network (WSN) applications for efficient data accumulation, localized sensor reprogramming, and for distinguishing and revoking compromised sensors. However, in sensor networks that make use of the existing key predistribution schemes for pairwise key establishment and authentication between sensor nodes and mobile sinks, the employment of mobile sinks for data collection elevates a new security challenge: in the basic probabilistic and q-composite key predistribution schemes, an attacker can easily obtain a large number of keys by capturing a small fraction of nodes, and hence, can gain control of the network by deploying a replicated mobile sink preloaded with some compromised keys. This article describes a three-tier general framework that permits the use of any pairwise key predistribution scheme as its basic component.
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The Three-Tier Security Scheme in Wireless
Sensor Networks with Mobile Sinks
ABSTRACT
Mobile sinks (MSs) are vital in many wireless sensor network (WSN)
applications for efficient data accumulation, localized sensor reprogramming, and for
distinguishing and revoking compromised sensors. However, in sensor networks that
make use of the existing key predistribution schemes for pairwise key establishment
and authentication between sensor nodes and mobile sinks, the employment of mobile
sinks for data collection elevates a new security challenge: in the basic probabilistic and
q-composite key predistribution schemes, an attacker can easily obtain a large number
of keys by capturing a small fraction of nodes, and hence, can gain control of the
network by deploying a replicated mobile sink preloaded with some compromised
keys. This article describes a three-tier general framework that permits the use of any
pairwise key predistribution scheme as its basic component. The new framework
requires two separate key pools, one for the mobile sink to access the network, and one
for pairwise key establishment between the sensors. To further reduce the damages
caused by stationary access node replication attacks, we have strengthened the
authentication mechanism between the sensor and the stationary access node in the
proposed framework. Through detailed analysis, we show that our security framework
has a higher network resilience to a mobile sink replication attack as compared to the
polynomial pool based schemes.
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