Open Access
Table 1
Notations
| Notation | Description |
|---|---|
| Ui/GWi | User/Gateway |
| SDj | Sensor device |
| S | TMIS server |
| GIDi | GWi's identity |
| IDi | Ui's identity |
| SIDj PWi BIOi SKij Ki   Ek/Dk () ΔT h (∙) ⊕ || |
SDj's identity Ui's identity Ui's biometric Common session key between GWi and SDj S's master key Shared secret key between GWi and S Shared secret key between SDj and S Encryption and decryption Maximum transmission delay One-way Hash function Bitwise XOR operation Concatenation operation |
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