Cryptography & Codes

Survive the Cryptanalyst's Inferno: Extreme Code Breakers

Nine savage challenges await to forge true code-breaking masters amid classical and intricate encryption traps.

#cryptanalysis#Playfair rules#cipher decryption#Kasiski method#polyalphabetic#ADFGVX#index coincidence#Hill cipher#Vigenère attack

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hard

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Quiz Questions

Answer all questions below and test your knowledge.

1
In Kasiski's method for breaking Vigenère ciphers, repeated n-grams separated by distances of 7, 14, and 21 letters primarily indicate what about the key?
Question 1
2
For a Playfair cipher with keyword 'ZEALOT', how is the digraph 'HE' encrypted using the 5x5 grid?
Question 2
3
To decrypt a Hill cipher ciphertext with matrix [[3,2],[5,1]] mod 26, what is the required decryption matrix?
Question 3
4
In frequency analysis, a polyalphabetic cipher's index of coincidence is typically what compared to monoalphabetic?
Question 4
5
Baconian cipher encodes binary via letters A-Z where A=aaaaa, B=aaaab. What 5-bit string hides in 'BACCC'?
Question 5
6
Wait, fix Q5: In Baconian, the bold/italic A/B variant uses 24 letters for 5-bit (32>26). But standard hides message in two typefaces. What binary does 'AbACc' represent?
Question 6
7
ADFGVX cipher (WWI) fractionates plaintext into 6x6 grid, then columnar transposes. Breaking it first requires?
Question 7
8
For an autokey cipher using keyword 'KEY' on plaintext 'ATTACKATDAWN', what is first ciphertext letter?
Question 8
9
To detect Vigenère period via index of coincidence, you slide windows and find high IC at lags that are?
Question 9
10
Enigma machine weakness exploited by Turing: if a rotor is unchanged from previous message, typing same letter twice gives?
Question 10

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Survive the Cryptanalyst's Inferno: Extreme Code Breakers

Quiz Intelligence

Quiz Questions

In Kasiski's method for breaking Vigenère ciphers, repeated n-grams separated by distances of 7, 14, and 21 letters primarily indicate what about the key?

For a Playfair cipher with keyword 'ZEALOT', how is the digraph 'HE' encrypted using the 5x5 grid?

To decrypt a Hill cipher ciphertext with matrix [[3,2],[5,1]] mod 26, what is the required decryption matrix?

In frequency analysis, a polyalphabetic cipher's index of coincidence is typically what compared to monoalphabetic?

Baconian cipher encodes binary via letters A-Z where A=aaaaa, B=aaaab. What 5-bit string hides in 'BACCC'?

Wait, fix Q5: In Baconian, the bold/italic A/B variant uses 24 letters for 5-bit (32>26). But standard hides message in two typefaces. What binary does 'AbACc' represent?

ADFGVX cipher (WWI) fractionates plaintext into 6x6 grid, then columnar transposes. Breaking it first requires?

For an autokey cipher using keyword 'KEY' on plaintext 'ATTACKATDAWN', what is first ciphertext letter?

To detect Vigenère period via index of coincidence, you slide windows and find high IC at lags that are?

Enigma machine weakness exploited by Turing: if a rotor is unchanged from previous message, typing same letter twice gives?

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