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

Table 15

Communication comparison.

Schemes	M1	M2	M3	M4	Total bytes
Choi et al. [1]	80	124	44	68	316	+64
Chang and Le [3, Scheme 2]	64	84	64	44	256	+4
Fan et al. [7]	128	68	60	100	356	+104
Nam et al. [9]	52	104	40	56	252	0
PriAuth	64	108	40	40	252	0

means compared with our scheme; M1, M2, M3, and M4 mean Messages 1, 2, 3, and 4.