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Table 1 Notations and their definitions.

From: Secure Clustering and Symmetric Key Establishment in Heterogeneous Wireless Sensor Networks

Notation Definition
Number of sensor nodes in the network
Area that sensor nodes are deployed
Number of gateways in the network
Number of neighbor nodes
Transmission range of each sensor node
Largest radius of a cluster covered by each gateway
Sensor node ,
Area covered by each sensor node
Gateway ,
Symmetric key between sensor node and
, Public and private key of sensor node ,
Probability of node to be compromised
, Public and private key of gateway ,
The encryption function using the key
The decryption function using the key
Number of links connected to the node