 |
| secure communication: 95 phrases in 14 subjects |
| Astronautics | 3 |
| Communications | 1 |
| Computer networks | 1 |
| Computers | 1 |
| Diplomacy | 1 |
| Electronics | 3 |
| Information security and data protection | 14 |
| Microsoft | 1 |
| Military | 38 |
| Programming | 1 |
| Radio | 1 |
| Security systems | 24 |
| Software | 1 |
| Telecommunications | 5 |