Classic Codes Knowledge Check
A focused set of questions exploring landmark encryption schemes and their creators.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which ancient Roman leader is credited with popularizing the shift cipher that bears his name?
- 2
The Vigenère cipher was originally described as a “le chiffre indéchiffrable.” Who later broke it in the 19th century?
- 3
In the Enigma machine, which component performed the final substitution before the signal reached the lampboard?
- 4
The Navajo Code Talkers contributed to US communications in which conflict?
- 5
What was the primary purpose of the “Purple” cipher machine used by Japan before and during WWII?
- 6
Which mathematician created the one‑time pad, the only provably unbreakable cipher when used correctly?
- 7
The “Scytale” used by Spartans is an example of what type of cipher?
- 8
During the American Civil War, which device allowed Union forces to decode Confederate telegraph messages?
- 9
Which 16th‑century invention introduced a systematic method for polyalphabetic encryption?
- 10
The “Great Cipher” of France, solved by Étienne Bazeries, employed what distinctive feature?
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