1. What are some advantages and disadvantages of using long passwords? 2. We discussed fixed and one-time passwords as two extremes. What about frequently changed passwords? How do you think this...

1. What are some advantages and disadvantages of using long passwords?

2. We discussed fixed and one-time passwords as two extremes. What about frequently changed passwords? How do you think this scheme can be implemented? What are the advantages and disadvantages?

3. How can a system prevent a guessing attack on a password? How can a bank prevent PIN guessing if someone has found or stolen a bank card and tried to use it?