QUESTION 1 In the following cipher a sender of a message has set randomly the cipher alphabet in order to replace the plain text alpahbet 1ABCDEFGHI KLMNOPQRSTUVWXYZ 2TGXAF MP BVRSNDUYZKWLCHJIEQO 1. Give the secret key that the sender should share with the receiver 2. Give the number of the secret keys that an attacker should try to decrypt an intercepted message. 5 points The following question is encrypted by Caesar cipher. The used key corresponds to the number of students who attended the last session on campus. You need to test all possible keys if you don't know the number of students who attended the last class session on campus. You will obtain half of the grade if you decrypt the question. The other half of the grade will be given if you answer the question correctly. QUESTION 4 The encrypted question Ibtpemr alc gepgypexmrk XGT wxexi fc e wxexijyp jmviaepp mw qsvi vipmefpi xler YHT wxexi. QUESTION 11 Save Answer Vulernabilities of Information systems are always present. What are the best practices to reduce the impacts of their exploitations on our resources?