[Retracted] Fog-Driven Secure Authentication and Key Exchange Scheme for Wearable Health Monitoring System

Table 5

Communication cost evaluation.

	Rounds	Cost (bits)
[24]	4	= 5696
[25]	3	= 4800
[26]	4	= 7744
[28]	4	= 5696
[29]	3	= 4800
Our scheme	4	= 3072