a c Use the criteria indicated to create a pair of 3 x 3 matrices D D where the entries of the matrix D are all integers 20 marks i d 1 5 d3 2 2 Create your own substitution cipher Then use it and the matrix D you created in a to encrypt the title of your favourite movie 20 marks ii Use the matrix D and the appropriate substitution cipher to decrypt the message from b 20 marks