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Secure communication : 93 phrases in 15 subjects |
| Astronautics | 3 |
| Communications | 1 |
| Computer networks | 1 |
| Computers | 1 |
| Diplomacy | 1 |
| Electronics | 3 |
| Information security and data protection | 14 |
| Microsoft | 1 |
| Military | 36 |
| Programming | 1 |
| Quantum electronics | 1 |
| Radio | 1 |
| Security systems | 23 |
| Software | 1 |
| Telecommunications | 5 |