| Abbreviation | Definition |
|---|---|
| NEU | Network Encryption Unit |
| NGFW | Next Generation FireWall |
| NI | Next Intel |
| NIACAP | National Information Assurance Certification and Accreditation Process |
| NICI | Novell International Cryptographic Infrastructure |
| NID | Network Intrusion Detection |
| NIDS | Network Intrusion Detection System |
| NIM | Not-Inside Message |
| NINA | Non-Intrusive Network Assessment |
| NIS | Norton Internet Security |
| NIV | No Information Verified |
| NKM | Navy Key Management |
| NKMO | Navy Key Management Officer |
| NKMS | Navy Key Management System |
| NL | New Lock |
| NLE | Network-Layer Encryption |
| NLI | Not Logged In |
| NMH | Non-linear Modular Hashing |
| NOSC | Network Operations Security Center |
| NP | No Password |