| Modem, e.g. |
| Cryptologist |
| Spy, at times |
| Ciphers writer |
| Cryptogram writer |
| Ciphertext writer |
| Enciphering machine |
| Enigma machine user |
| Cryptographer's device |
| Secret language device |
| Video compressor, e.g. |
| One who writes cryptograms |
| Video-compressing algorithm |
| Person with something to hide |