| D'Agapeyeff cipher(noun, expression, technology, entity, history) |
| Eleanor Ireland(noun, expression, technology, entity, history) |
| Erich Huttenhain(noun, expression, technology, entity, history) |
| FRUMEL(noun, technology, entity, history, cryptography) |
| Far East Combined Bureau(noun, expression, technology, entity, history) |
| Federal Bureau of Investigation-Apple encryption dispute(noun, expression, technology, entity, history) |
| Ferdinand Voegele(noun, expression, technology, entity, history) |
| Fish(noun, technology, entity, history, cryptography) |
| Fleet Radio Unit(noun, expression, technology, entity, history) |
| Free Speech Flag(noun, expression, technology, entity, history) |
| Grill(noun, technology, entity, history, cryptography) |
| Gulf of Tonkin incident(noun, expression, technology, entity, history) |
| His Majesty's Ship Magdeburg(noun, expression, technology, entity, history) |
| Japanese army code(noun, expression, technology, entity, history) |
| Japanese cryptology(noun, expression, technology, entity, history) |
| Japanese diplomatic code(noun, expression, technology, entity, history) |
| Japanese naval code(noun, expression, technology, entity, history) |
| Kolab Now(noun, expression, technology, entity, history) |
| Kryptos(noun, technology, entity, history, cryptography) |
| Lavabit(noun, technology, entity, history, cryptography) |