Master the Secrets of Historic Encryption
A rigorous set of ten questions probing the secrets of historic cryptographic techniques.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which device, employed by the German military in World War II, used rotors to produce polyalphabetic substitution?
- 2
The cipher attributed to Julius Caesar shifts each letter by how many positions in the alphabet?
- 3
In 1917, the British cryptanalyst William Friedman introduced a method to break which cipher used by the U.S. Army?
- 4
The Zimmerman Telegram, intercepted in 1917, was encoded using which cipher system?
- 5
What is the name of the 16th‑century cipher that employs a repeating keyword to shift letters, later popularized by Blaise de Vigenère?
- 6
The British cryptographic machine known as Typex was based on which earlier German invention?
- 7
The ancient Spartan scytale encoded messages by wrapping a strip of parchment around a rod of what shape?
- 8
Which 19th‑century cipher used a grid of letters to encrypt pairs of plaintext characters?
- 9
The M-138-A cipher device used by the US Army in World War II employed which principle?
- 10
Which British mathematician is credited with designing the bombe that helped decipher the Enigma?
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