Master the Art of Decrypting Complex Ciphers
A rigorous set of puzzles that push your ability to solve historic and modern encryption methods.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which Enigma rotor sequence was historically used by the German Navy on U‑boat communications in early 1942?
- 2
What minimum RSA modulus length is considered insecure against modern factoring attacks as of 2025?
- 3
If a ciphertext shows a repeating pattern every 7 letters, which technique most directly reveals the key length?
- 4
Reusing a one‑time pad for two messages reveals which property?
- 5
Which characteristic distinguishes a homophonic substitution cipher from a simple monoalphabetic cipher?
- 6
In least‑significant‑bit image steganography, what does altering the LSB of a pixel primarily affect?
- 7
Which mode provides confidentiality without authentication, making it vulnerable to bit‑flipping attacks?
- 8
Who first described the principle of known‑plaintext attack in the early 20th century?
- 9
Which curve parameter determines the group order for a given elliptic curve over a prime field?
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