Research Article
A Lightweight and Secure Anonymous User Authentication Protocol for Wireless Body Area Networks
Table 6
The comparison of communication cost in different schemes.
| Scheme | Number of messages | Communication cost (bits) |
| Wu et al.’s scheme | 3 | 2112 | Shen et al.’s scheme | 4 | 3040 | Das et al.’s scheme | 2 | 1536 | Liu et al.’s scheme | 4 | 3840 | Proposed scheme | 2 | 2816 |
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