Research Article
A Lightweight Privacy Protection User Authentication and Key Agreement Scheme Tailored for the Internet of Things Environment: LightPriAuth
Table 7
The cost of hash operations in the registration phase.
| Phase | User registration | Sensor registration | Entity | User | Gateway | Total | Ratio | Sensor | Gateway | Total | Ratio |
| Wu et al. [9] | 2 | 3 | 5 | 2.5 | 0 | 1 | 1 | 1/7 | Wu et al. [14] | 2 | 3 | 5 | 2.5 | 0 | 1 | 1 | 1/7 | Chang and Le [11] | 1 | 2 | 3 | 1.5 | 0 | 1 | 1 | 1/7 | Chen et al. [1] | 1 | 1 | 2 | 1 | 3 | 4 | 7 | 1 | LightPriAuth | 1 | 2 | 3 | 1.5 | 0 | 1 | 1 | 1/7 |
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