Hard Code‑Breaking Challenge
A rigorous set of nine multiple‑choice challenges that probe deep knowledge of secret‑writing methods and their vulnerabilities.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which shift value correctly decrypts the ciphertext 'KHOOR ZRUOG' to a recognizable English phrase?
- 2
A ciphertext encrypted with a Vigenère cipher shows a repeating distance of 6, 12, and 18 between identical trigrams. What is the most likely key length?
- 3
Which condition makes RSA decryption vulnerable to a simple ciphertext‑only attack?
- 4
When performing frequency analysis on a monoalphabetic substitution cipher, which letter in English is statistically most useful to start the mapping?
- 5
Which statement correctly describes the security property of a one‑time pad?
- 6
In 2024, researchers demonstrated a practical collision for which widely used hash function?
- 7
A homophonic substitution cipher maps the plaintext letter 'E' to multiple ciphertext symbols to flatten frequency. Which of the following is a primary advantage of this method?
- 8
Which post‑quantum cryptographic scheme is based on lattice problems and has been shortlisted by NIST?
- 9
The 'Zimmermann Telegram' was deciphered during WWI using which cryptographic system?
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