Related Clues:
- Spy, at times
- Ciphertext writer
- Type of ring
- Person with something to hide
- Mail-away ring
- Kind of ring
- One gaining intelligence, maybe
- Cryptographer
- Cryptogram solving device
- Kind of promotional ring once offered by Ovaltine
- Modem, e.g.
- Reader of secret messages
- Cryptogram writer
- Translator of 'The German Eating Fish'
- Certain cracker