Hill cipher in Cryptography

    Solve the following
    
    Exercise 1
    Encrypt and Decrypt the Message “SITESCHOOL” using Hill Cipher with the key as shown in the image below. Show all the steps in the solution.
    
    
    Exercise 2
    Encrypt and Decrypt the Message “AROUNDHERE” using Hill Cipher with the key as shown in the image below. Show all the steps in the solution.
    
    
    Exercise 3
    Encrypt and Decrypt the Message “GEOGRAPHY” using Hill Cipher with the key as shown in the image below. Show all the steps in the solution.
    
    
    Exercise 4
    Encrypt the message “secretcode” using Hill Cipher 
    Decrypt the message “eejfqocj” using Hill Cipher 
    Consider the matrix given below as the key.  Show all intermediate results in your computation.