| Abbreviation | Definition |
|---|---|
| HIPA | Health Information Privacy Act of 1999 |
| HIPS | Host Intrusion Prevention System |
| HKP | Horowitz Key Protocol |
| HLBR | Hogwash Light BRidge security software |
| HMAC | Hash-based Message Authentication Code |
| HOST | Hotel Operating Statistics |
| HPA | Host Protected Area |
| HSM | Hardware Security Module |
| HSP | Hidden Service Protocol |
| HT | Hash Table |
| HTL | Hack Tracking Log |
| HTS | Hack This Site |
| HTTPS | HyperText Transfer Protocol Secure |
| HUGS | Harness Ultra Guard System |
| I | Insecure |
| IA | Identification Authentication |
| IA | Impersonation Attack |
| IA | Information Assurance |
| IA | Instant Access |
| IAAC | Information Assurance Advisory Council |