| Abbreviation | Definition |
|---|---|
| CMS | Certificate Management Service |
| CMS | Classic Mole Style |
| CMS | Cryptographic Message Syntax |
| CMW | Compartmented Mode Workstation |
| CNS | Computer and Network Security |
| COAST | Computer Operations, Audit, and Security Tools |
| COPPA | Children's Online Privacy Protection Act of 1998 |
| COPS | Computer Oracle and Password System |
| CP | Code Page |
| CP | Compact Policy |
| CP | Copy Protected |
| CPA | Chosen Plaintext Attack |
| CPC | Cyberarmy Privacy Commission |
| CPL | Current Privilege Level |
| CPS | Current Protection Subdomain |
| CPSA | Content Protection System Architecture |
| CRACK | Challenge Response for Authenticated Cryptographic Keys |
| CRAM | Challenge Response Authentication Mechanism |
| CRAP | Challenge Response Authentication Program |
| CRHF | Collision-Resistant Hash Function |