Research Article
A Two-Factor RSA-Based Robust Authentication System for Multiserver Environments
Table 4
Communication and storage costs of our protocol and others.
| Scheme | Smart-card cost (bits) | Communication cost (bits) | Number of messages |
| Pippal et al. [14] | | | | Yeh [16] | | | | Wei et al. [32] | | | | Li et al. [33] | | | | Proposed | | | |
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