A Lightweight Privacy Protection User Authentication and Key Agreement Scheme Tailored for the Internet of Things Environment: LightPriAuth

Table 8

Communication comparison.

	Hash	ECC	Id	T	R	Total bytes	Com
Wu et al. [9]	10	4	4	0	1	564	+168
Wu et al. [14]	13	4	2	0	0	624	+228
Chang and Le [11]	9	2	1	5	0	412	+16
Chen et al. [1]	9	4	0	3	0	492	+96
LightPriAuth	5	4	2	2	1	396	0

Hash: means a general result data; ECC: means a random point on the elliptic curve, Id: means the identity of a sensor or a user; T: means a timestamp; R: means a general random number; Com: comparison between our scheme and the other schemes.