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| Values | Description |
|---|---|
| MNi | Mobile node |
| FAj | Foreign agent |
| HAk | Home agent |
| IDmi, IDfj, IDhk | Identities of MNi, FAj, HAk |
| PWmi | Password of MNi |
| BIOmi | Biometrics of MNi |
| Tx | Timestamp of x |
| nx | Random number of x |
| rx | Random nonce for a specific purpose |
| SKx | Session key of x |
| Ek(⋅), Dk(⋅) | Symmetric encryption/decryption |
| h(⋅) | Hash function |
| H(⋅) | Bio-hash function |
| || | Concatenation |
| ⊕ | XOR operation |
| KF,H | Pre-shared secret key between FAj and HAk |
| KH | Private key of HAk |
