CS338 Computer Security
Friday, 18 October 2024

+ Exam
- Possible: 55
  High score: 55
  Median: 39.5   <-- good score! lots of knowledge

- Summary grade reports today or Monday

- Corrections
    - See details, W Oct 23
    - score = (original score + corrected score) / 2
    - opportunity to sharpen your knowledge

- General notes
    - "Rivest, Shamir, Adleman" - sorry not sorry
    - Vocabulary
    - Precision
        - encoding vs. encryption
    - Protocols & step-by-step procedures

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+ DMCA, Doctorow's essay
- Digital Millennium Copyright Act 1998, section 1201
- Outrages
    - Farmer can't fix their own tractor
        have to get a John Deere tech out to do it
    - In a movie, strobe (bad for epilepsy)
        can't modify the movie to fix this
- Mexico copying US phrasing (maybe a bad idea)
- People add TPMs out of fear of nefarious users
- Exceptions for archiving, but not for security testing
- Repairing your own stuff
  Installing software of your choice on your own device
   ...

+ Wanna practice? Here's a Duo puzzle
- Before
    - Enter user/password on a carleton.edu website
    - Popup gives you some Duo options
    - Go to your phone
    - Click the OK button in Duo
    - Back on the website, you now get the content you were logging in for
- Now
    - Enter user/password on a carleton.edu website
    - Popup gives you some Duo options & a 3-digit code
    - Go to your phone
    - Enter the 3-digit code and click the OK button in Duo
    - Back on the website, you now get the content you were logging in for
- Question
    - what attack does this new system prevent?
    - draw a careful step-by-step diagram of who does what when
        to support your answer