Table 1.
Notations used throughout this paper.
| Symbol | Description |
|---|---|
| Ui | User |
| Sj | Sensor node |
| GWN | Gateway node |
| IDi/PWi | Identity/Password of the user Ui |
| SIDj/PWj | Pre-configured identity/password of the sensor node Sj |
| KGWN_U/KGWN_S | Two private system parameters only know to GWN |
| TCi/TCj | A temporal credential issued by GWN to Ui/Sj |
| TS | The timestamp value |
| KEYij | The shared session key between Ui and Sj |
| TEi | The expiration time of Ui's temporal credential |
| ⊕ | The bitwise exclusive-OR operation |
| H(•) | The one-way hashing function |
| ‖ | The bitwise concatenation operation |