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Table 3 Root-key distribution steps and their time/energy usage.

From: Broadcast Secrecy via Key-Chain-Based Encryption in Single-Hop Wireless Sensor Networks

Task Time (sec) Energy (J)
Creation of ECC keys 53.2 3.25
Verification of digital signature 59.8 5.54
Creation of digitally signed message 35.7 3.58
Sending message to base-station 3.7 0.38
Waiting period 1.3 0.12
Diffie-Hellman key exchange 5.5 0.57
Decryption of root-key 9.7 0.79
Sending message to base-station 3.6 0.33
Total 172.5 14.56