Cryptography Key Terminologies Quiz

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Questions and Answers

What is the purpose of the secret key in encryption?

  • To decrypt the ciphertext (correct)
  • To transform the plaintext to the ciphertext
  • To generate the ciphertext
  • To choose the encryption algorithm

What is the primary function of the decryption algorithm?

  • To scramble the message
  • To create the ciphertext
  • To produce the original plaintext (correct)
  • To encrypt the plaintext

What is the main characteristic of the Caesar cipher?

  • Involves simple mapping or substitution (correct)
  • Uses a secret key for encryption
  • Operates using a transposition technique
  • Produces random stream of data

What does the substitution technique in cryptography involve?

<p>Replacing plaintext units with another unit based on a predefined system (C)</p> Signup and view all the answers

What is the basic idea of a transposition cipher?

<p>Shuffling the positions of characters based on a specific rule (C)</p> Signup and view all the answers

How does the Columnar Transposition technique rearrange the plaintext?

<p>It writes out the plaintext in rows and then reorders the columns (C)</p> Signup and view all the answers

What is the recipient required to know in order to decrypt a message encrypted using Columnar Cipher?

<p>The order of columns (the key) (C)</p> Signup and view all the answers

What is the purpose of choosing a key in the encryption process of Columnar Cipher?

<p>To determine the order in which the columns will be read (D)</p> Signup and view all the answers

How many rows are needed for the Rail Fence cipher with a keyword of six letters?

<p>7 (C)</p> Signup and view all the answers

What is the key in the Rail Fence cipher?

<p>Number of rows used (D)</p> Signup and view all the answers

Which cipher rearranges the characters of a message based on a pattern resembling a zigzag or rail fence?

<p>Rail Fence Cipher (A)</p> Signup and view all the answers

How is the plaintext 'DEFEND THE EAST WALL' encrypted using the Rail Fence cipher?

<p>The message is written on alternate lines across the page (D)</p> Signup and view all the answers

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