Intense Cipher Decryption Challenge
A challenging set of nine code‑breaking questions testing deep knowledge of historic and modern ciphers.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
To determine the key length of a Vigenère cipher, which technique examines repeated sequences and computes their greatest common divisor?
- 2
What is the primary effect of the Enigma machine's plugboard on the encryption process?
- 3
Which statement is NOT a property of a one‑time pad when used correctly?
- 4
The Hill cipher relies on which mathematical concept for encryption?
- 5
When attacking a simple substitution, which plaintext letter is statistically most frequent in English?
- 6
Which algorithm is especially vulnerable to known‑plaintext attacks due to its linear structure?
- 7
In code‑breaking, what does the term "crib" refer to?
- 8
What purpose does the reflector serve in the Enigma machine?
- 9
Which block cipher mode offers confidentiality but does not inherently provide integrity protection?
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