a b c . z

1
Question 3
a b c . z 0 1 2 . 25
Map
Cipher
Plain
Shift (Cipher Plain) mod 26
2

• We guess that the Key is naughty
• To verify that naughty is indeed the Key, we
  attempt to shift the decrypted text to Position
  0.
• Position 0 is where a Key should start.
• We note that naughty starts at Position 0.
• Hence naughty is the Key.