2. In this problem we want to decrypt short messages which have been encrypted t a Caesar cipher. Use the Vigenere square, not the Brute Force approach. You should use the most commonly occurring letters/words in the English language as your strategy for decryption. The correct answer will only receive 50% credit if you don't provide your justification. For Justifications, you should add something like the most common letter in English is E so we try the most frequently occurring letter in the message for E which means the message was encrypted with a shift of ... which gives... which is not an English word. Next we try..."

(a) Decrypt the word

MBMTGBV

and give the key, eg, say "Shift 22 Right". Explain your reasoning

(b) Decrypt the message.

P SVCL JYFWAVNYHWOF

and give the key, eg, say "Shift 22 Right" Explain your reasoning