Codebusters Test Codebusters Transposition Ciphers 3

Question 1

What distinguishes the Myszkowski transposition from standard columnar transposition?

Accepted Answer

Repeated letters in the keyword cause their columns to be combined and read together left to right before moving to the next rank

Answer

It uses a numeric key instead of a keyword

Answer

It applies the transposition vertically instead of horizontally

Answer

It uses a two-dimensional keyword grid

Question 2

How does a turning grille cipher work?

Accepted Answer

A card with cut-out holes is placed over paper; the holes are filled, the card is rotated 90°, holes filled again — repeated four times to fill the grid

Answer

Letters are encrypted by rotating them through the alphabet by the number of grille holes

Answer

A grille with rows of holes is slid across the plaintext to select letters for the ciphertext

Answer

A stencil with the keyword is rotated to align key letters with plaintext positions

Question 3

Which of the following is the strongest attack strategy against a single columnar transposition with an unknown keyword?

Accepted Answer

Anagram the columns by testing column orderings that produce the best English digraph scores between adjacent column pairs

Answer

Brute-force all 26 Caesar shifts

Answer

Apply the Kasiski examination to find repeated trigrams

Answer

Use differential cryptanalysis on the first and last columns

Question 4

Which of the following is correctly classified as a transposition cipher rather than a substitution cipher?

Accepted Answer

Rail fence cipher

Answer

Vigenère cipher

Answer

Caesar cipher

Answer

Atbash cipher

Question 5

In a Codebusters competition, if a transposition ciphertext has 30 letters and you suspect columnar transposition with a 5-letter keyword, how many rows does the grid have?

Accepted Answer

6 rows

Answer

4 rows

Answer

5 rows

Answer

7 rows

Question 6

What is the primary cryptanalytic weakness of transposition ciphers compared to substitution ciphers?

Accepted Answer

Transposition ciphers preserve plaintext letter frequencies, making the cipher type detectable and enabling anagramming attacks

Answer

Transposition keys are always shorter than substitution keys

Answer

Transposition ciphers cannot handle messages longer than 26 letters

Answer

Transposition ciphers require publicly known routes to function

Question 7

In Codebusters, if you see a cipher labeled 'Aristocrat,' what type of cipher is it, and how does it differ from a Patristocrat?

Accepted Answer

Both are monoalphabetic substitution ciphers; Aristocrat keeps word spaces while Patristocrat removes them

Answer

Both are transposition ciphers; Patristocrat uses two rails while Aristocrat uses one

Answer

Aristocrat is a columnar transposition; Patristocrat adds a keyword substitution step

Answer

Aristocrat uses a Vigenère tableau; Patristocrat uses a single-letter Caesar shift