| Clue | Source | Date |
|---|---|---|
| Confidential communication channel | NYT Easy Mode | 09 Sep 2026 |
| System by which all speech is protected? | New York Times | 04 Sep 2026 |
| It's bug-free | Universal | 19 Dec 2024 |
| What might be used to make a phone call, in a spy thriller | ||
| Phone connection that can't be tapped | Newsday | 07 Mar 2021 |
| *Phone that can't be tapped |