| Abbreviation | Definition |
|---|---|
| NPED | New Party Entrance Dataset |
| NPF | Norton Personal Firewall |
| NPP | National Privacy Principles |
| NRP | Nominal Rate of Protection |
| NSA | Network Security Administration |
| NSIF | National Security Industry Forum |
| NSIS | Nullsoft Scriptable Install System |
| NSPK | Needham-Schroeder Public-Key |
| NSSA | National Security Space Architect |
| NST | Network Security Toolkit |
| NSTIC | National Strategy on Trusted Identities in Cyberspace |
| NT | Not Trusted |
| NTMG | Network Threat Management Gateway |
| NTR | No Trusting Required |
| NU | New User |
| NUT | N-Universal Transformation |
| NV | New Variant |
| NVH | Network- Vs. Host-based intrusion detection |
| NVT | Network Vulnerability Tool |
| NYB | New York Boot virus |