Symbol	Description
	Sensor node ID.
	Sensor reading of a node.
	A symmetric key between a node and the base station.
	A symmetric key between a node and a node.
	Symmetric keys shared between the base station and leaf nodes.
	Ciphertext generated by a node.
	A nonce transmitted by the base station in a query.
	A provably secure pseudo random function.
	A modulus, predefined by the base station.
	Homomorphic MAC tag generated by a node using a key pair.
	MAC tag generated by a node using a key shared with its neighboring node.
	A number that represents the child nodes of an intermediate node.
HDR	Header information that uniquely identifies the node.