Answer each question below in 1-2 paragraphs or using diagrams, as
appropriate.

1.  Design a 3-factor authentication scheme that requires a user to
    enter a password, present an iris scan, and possess a smart-card
    in order to log in.  Assume an attacker that steals the smart card
    can read all the data stored on the card.

2. List as many protected registers/instructions on a CPU as you can
   think of.  Try not to list instructions/registers that are not
   protected.