| Abbreviation | Definition |
|---|---|
| GSP | Guardian Service Processor |
| GWV | Gnutella Worm Victim |
| H | Hoax |
| HAC | Hierarchical Access Control |
| HAK | Hacker Assault Kit |
| HAL | Hackers At Large |
| HARS | Homomorphic Authenticable Ring Signature |
| HATS | High Assurance Transformation System |
| HBA | Host-Based Authentication |
| HC | High Compression |
| HDC | Handle for Device Context |
| HDCP | High-bandwidth Digital Content Protection |
| HEAD | Hand-held Encryption Authentication Device |
| HEPKI | Higher Education Public Key Infrastructure |
| HIDS | Host Intrusion Detection System |
| HIP | Hacking In Progress |
| HIP | Health Information Privacy |
| HIP | Host Interface Program |
| HIP | Host Intrusion Prevention |
| HIP | Host-based Intrusion Prevention |