A Lightweight Secure User Authentication and Key Agreement Protocol for Wireless Sensor Networks

Table 4

Performance comparison.

Entity	[26]	[29]	[50]	[41]	[44]	[45]	[49]	Ours
Ui	11Th + 2Tm + Ts	14Th + 2Tm	7Th + TR + 3Tm + Ts	11Th + TR + 2Tm	10Th + TR + 3Tm	8Th + TR + 2Tm	12Th + 3Tm	12Th + TR + 2Tm
GWN	11Th + 2Ts	13Th	6Th + Tm + Ts	10Th	13Th + Tm	9Th + Tm	8Th + Tm	10Th + Ts
Sj	4Th + 2Tm + Ts	4Th + 2Tm	2Th + 2Tm + 2Ts	3Th + 2Tm	6Th + 2Tm	4Th	4Th + 2Tm	5Th + 2Tm + Ts
Total cost	26Th + 4Tm + 4Ts	31Th + 4Tm	15Th + TR + 6Tm + 4Ts	24Th + TR+4Tm	29Th + TR + 6Tm	21Th + TR + 3Tm	24Th + 6Tm	27Th + TR + 4Tm + 2Ts
Computation cost	29.94 ms	29.42 ms	51.99 ms	36.77 ms	51.48 ms	29.42 ms	44.13 ms	37.03 ms
Communication cost	3208 bits	3424 bits	2880 bits	3072 bits	2368 bits	2496 bits	2880 bits	3328 bits