Expert Code‑Breaking Quiz
A rigorous set of eight multiple‑choice items probing sophisticated decryption methods across centuries.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
A message reads 'KHOOR ZRUOG' after being enciphered with a shift cipher. Which plaintext corresponds to it?
- 2
In a Vigenère cipher with keyword 'LEMON', the ciphertext fragment 'RIJVS' decrypts to which of the following?
- 3
An Enigma machine operator sets rotors I-II-III, ring settings 01-01-01, and reflector B. With plugboard pairings AB and CD, the ciphertext 'QFN' decrypts to which three‑letter group?
- 4
A ciphertext shows the letter frequency: E 12%, T 9%, A 8%, X 0.5%. Which substitution is most likely incorrect?
- 5
A one‑time pad key of length 5 is '10101'. Ciphertext '11000' XORed with the key yields which plaintext?
- 6
RSA modulus N = 55, public exponent e = 3. Ciphertext C = 27. What is the original plaintext M?
- 7
A steganographic image hides a message in the least‑significant bits of the red channel. Which tool is commonly used to extract such data?
- 8
In a hash‑collision attack against MD5, which of the following techniques is most effective?
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