Codebusters Cipher Decryption

Question 1

Which of the following is the correct decryption of the cipher "Wklv lv d whvw phvvdjh." using a Caesar cipher with a shift of 3?

Accepted Answer

This is a test message.

Answer

This is a trial message.

Answer

This is a secret message.

Answer

This is an encrypted message.

Question 2

If a message is encoded with a Vigenère cipher using the keyword "KEY," what would be the first letter of the decrypted message if the ciphered letter is "F"?

Accepted Answer

E

Answer

B

Answer

C

Answer

D

Question 3

Which of the following ciphers is based on shifting the alphabet by a fixed number of positions?

Accepted Answer

Caesar cipher

Answer

Vigenère cipher

Answer

Playfair cipher

Answer

Enigma cipher

Question 4

In a substitution cipher, the letter "L" has been replaced by the letter "X" in the ciphertext. What is this process called?

Accepted Answer

Substitution

Answer

Transposition

Answer

Shift

Answer

Steganography

Question 5

Using the Atbash cipher, what is the decryption of the letter "M"?

Accepted Answer

N

Answer

L

Answer

O

Answer

S