What are the answers for all this questions ?

Problem 1 ( 3 pts ) Classify each of the following as a violation of confidentiality, integrity, availability, or some combination thereof. - John copies Mary's homework. - Carol changes the amount of Angelo's check from $100 to $1000. - Jonah obtains Peter's credit card number and had the credit card company cancel the card and replace it with another card bearing a different account number, Problem 2 ( 3 pts) The following message was encrypted by using the Playfair Cipher and the keyword "LIGHT". OFLTHKCMDFBHOGTDJGHTIZTGDGYDHKDUMPFNIBLTHK a) Show the matrix and the plaintext. b) Decrypt the message c) Encrypt your first and last name by using the same matrix. Problem 3 (2 pts) Discuss the following: a) Four kinds of threats b) The three key objectives or the CIA triad You should use the Blackboard system as an example to support your answer. Problem 4 (2 pts) Can a system without integrity provide confidentiality? Can a system without confidentiality provide integrity? Justify your answers. Note: Consider computer systems only, but do NOT consider cryptography or secure communications