Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| Notations | Description |
|---|---|
| Ui | User |
| Sj | EPR information system server |
| IDi | Identity of Ui |
| PWi | Password of Ui |
| New password of Ui | |
| R | Number of times Ui re-registers to Sj |
| Bi | Biometric information of Ui |
| Xu | Secret number generated by Ui |
| H | Secret number generated by Sj |
| K | Secret key of Sj |
| r1 | Random number generated by Ui |
| r2 | Random number generated by Sj |
| h(⋅) | One-way hash function |
| H(⋅) | Bio-hash function |
| X||Y | Concatenate operation |
| ⊕ | XOR operation |
