Security Analysis and Improvements of Session Key Establishment for Clustered Sensor Networks

Table 4

Energy costs comparison of the proposed scheme (during sessions).

Schemes	Nodes	Total energy costs	Energy cost comparison (mJ)
The proposed scheme	Gateway
	Cluster head
Lee and Kim’s scheme [17]	Gateway
	Cluster head

Energy cost comparison based on the experimental results in [28]. We assume that the cluster head transmits the total of byte data to the gateway during sessions.