| Subtype | Quantum cryptography |
| Used in | |
| Developed | 1940s |
| Discipline | Cryptography |
| Developed by | Military technology |
| Core principles | Remain undiscovered |
| Originally used for | Encrypted communications • Military intelligence |
| Became public knowledge | 1970s |
| Public awareness through | Leaks • Declassified information |
| Refinement and expansion | Ongoing |
