| Abbreviation | Definition |
|---|---|
| MSSE | MicroSoft Security Essentials |
| MSSK | McGruff Safer Senior Kit |
| MSV | Magnetic Strip Verification |
| MTIPS | Managed Trusted Internet Protocol Service |
| MYK | Manage Your Keys |
| NACL | Named Access Control List |
| NADS | Network Anomaly Detection System |
| NAM | Numbered Access Module |
| NAS | Network Authentication Service |
| NAUP | Network Acceptable Use Policy |
| NAV | Norton Anti-Virus |
| NBSP | National Biometric Security Project |
| NC | No Check |
| NCC | No Cycle Checking |
| NCER | Non-Compliance Escalation Report |
| NCF | Neutral Code Format |
| NCSA | National Computer Security Association |
| NCSAM | National Cybersecurity Awareness Month |
| NE | Network Encryption |
| NEK | Network Encryption Key |