| Clue | Source | Date |
|---|---|---|
| Agents' keys to private entries? | The Telegraph Cryptic | 03 Jun 2022 |
| Encrypted terms (squares 2-8) | Universal | 19 Dec 2021 |
| Lexicon used by spies, and a key to the ends of the starred answers | Wall Street Journal | 07 Dec 2021 |
| Encrypted terms, or a hint to the first two letters of both parts of the starred answers? | Universal | 17 Dec 2020 |
| Substitute terms for sensitive subjects | New York Times | 16 Oct 2017 |
| Substitute terms for sensitive subjects | ||
| Diplomatic euphemisms | ||
| Hush-hush terms | ||
| Secret phrases |