1. Encrypt CEASE FIRE AT ELEVEN using a Caesar Cipher with Key=5. Remember that we shift down the alphabet.

1. Encrypt CEASE FIRE AT ELEVEN using the given Key.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Q M 3 G R A W Z 4 + P B T 2 X C H 7 U E S 8 1 L J F

3. Decrypt the string MBMTGBV which was encrypted with a Caesar Cipher and give the key, e.g., say ``Shift 22''.

4. Decrypt the string EILKNPWJP (which was encrypted with a Caesar Cipher) using the Vigenere square and the fact that ``E'', ``T'' and ``A'' are the most common letters. Give the correct shift and how many tries it took you.