Exercise 3: The Vigenère Cipher (30%)
Session 9: Week 18/19: Encryption
Exercise 1: The Caesar Cipher (50%)
Now think about the problem of cryptanalysis: that is, suppose you are "the enemy" and have intercepted a transmission known to have been encyphered with a Caesar cipher. How would you set about trying to decipher it? You may wish to challenge a colleague in the class to see who can decipher the other's ciphertext message most quickly. Record your conclusions in your report.