Due Fri:

• To Know:  Re-Do problems (if desired) are on canvas for Module 1 and 2.  Due Monday.
• To Do:  In the EC Digital Signature algorithm we studied, I mentioned that if k is re-used, there’s an attack.  Suppose you see Alice sign two messages:  (m1,R,s1) and (m2,R,s2).  Because R is the same, you know she used the same k.  Explain how to obtain k.  Then explain how to use that to obtain her secret key.  (Note: if it helps, you can assume the order of P is prime, at first.)  Hand in on canvas.