Mobile Intelligence

26.4 ADVERSARY MODEL

The adversary class is defined as a set of malicious entities intending to inflict loss either directly or through other entities on the network. It is responsible for defining, and if need be, introducing malicious nodes into the network, with the purpose of launching a distributed denial of service attack. The set of malicious nodes intending to launch a distribute denial of service attack in a wireless sensor network can be classified into the following categories: (a) injected sensor nodes, (b) compromised sensor nodes, and/or (c) laptop-class nodes. Injected sensor nodes again may consist of either sensor nodes with normal sensor capabilities or more powerful sensor nodes with the capabilities of say the base station. Laptop-class nodes are defined as nodes with more communication resources in terms of transmitting and receiving capabilities that is, stronger antennas as compared to standard sensor nodes. In addition, laptop-class nodes have a battery supply sustaining the node for a longer lifetime as compared to normal sensor nodes. Compromised nodes are defined as legitimate sensor nodes whose operations are taken over by the adversary class for purposes of disrupting normal network operations. In Figure 26.3, we illustrate a distributed denial of service attack model in the presence of various types of nodes in the network. The legitimate nodes of the network include intermediary data aggregation (DA) nodes, cluster heads, noncluster heads, and the ...