| Abbreviation | Definition |
|---|---|
| JKMS | Joint Key Management System |
| JMP1 | Password Over-ride JuMPer number one |
| JNSA | Japan Network Security Association |
| JPG | Joint Photographic Experts Group picture file |
| K | Key |
| KA | Key Address |
| KAM | Key Account Management |
| KAMP | Key Account Management Protocol |
| KAMS | Key Account Management System |
| KC | Key Code |
| KC | Key Conversion |
| KCN | Key Conversion Notice |
| KCSA | Key Control Self-Assessment |
| KCT | Key Conversion Time |
| KD | Key Data |
| KD | Key Define |
| KDC | Key Distribution Center |
| KDM | Key Dependent Message |
| KEA | Known Exponent Attack |
| KEK | Key Encryption Key |