Assumptions
	§ Simplex RF hardware is used (can either transmit or receive radio signals but not both) § Nodes are assumed to be physically vulnerable and can be compromised § Attacker can be present in the network from the beginning of network formation § Attacker’s computing platform can be much more powerful than that of the WSN nodes – We still consider attack difficulty and the benefit to the attacker of a successful attack (ETSI attack model)