Graded Exercise: Intro to Cryptography

This is not a quiz. This is an exercise. Simply fill out each part with your best effort for credit.  Please give it at least twenty minutes and not more than thirty.  (I'm talking about actual time on quiz -- Canvas may record that you had the quiz open for a couple days, but my main point is that I want you to truly attempt it but not get "stuck" on questions.)

Please watch the videos before starting this exercise.