Blockchain-Based Efficient Device Authentication Protocol for Medical Cyber-Physical Systems

Table 2

Computation cost.

	Shi [13]	Choi [14]	Xue [17]	Kumar [19]	Our protocol
	7 H + 3 ECC	12 H + 3 ECC	10 H	8 H	8 H
	5 H + 1 ECC	5 H + 1 ECC	14 H	9 H	7 H
	4 H + 2 ECC	7 H + 2 ECC	6 H	5 H	6 H
Total	16 H + 6 ECC	24 H + 6 ECC	30 H	22 H	21 H
Execution time	0.386 s	0.390 s	0.015 s	0.011 s	0.0105 s