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This is CS50

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This is CS50 🎃

  • Welcome, families! Visit cs50.ly/poll on your phone to participate during class!�
  • Masks are required. Please do not put classmates in a position of risk or discomfort by not adhering to protocol. And please do not put staff in a position of having to remind or escalate. Step outside or watch online instead.�
  • No food or drink in Sanders, please!�
  • If you'd like to view the projector screen on your own laptop during class and/or ask Carter questions via chat, visit cs50.ly/sanders, which will open a Zoom webinar. Be sure to mute your audio, as the webinar also contains video for those in isolation or quarantine.

Special thanks again to Valerie (and her mom!) for today’s festive scenery!

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before class, open

cs50.ly/poll

on your phone �to participate

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This is CS50 🎃

  • Welcome, families! Visit cs50.ly/poll on your phone to participate during class!�
  • Masks are required. Please do not put classmates in a position of risk or discomfort by not adhering to protocol. And please do not put staff in a position of having to remind or escalate. Step outside or watch online instead.�
  • No food or drink in Sanders, please!�
  • If you'd like to view the projector screen on your own laptop during class and/or ask Carter questions via chat, visit cs50.ly/sanders, which will open a Zoom webinar. Be sure to mute your audio, as the webinar also contains video for those in isolation or quarantine.

Special thanks again to Valerie (and her mom!) for today’s festive scenery!

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This is CS50

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cs50.ly/poll

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This is CS50

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passwords

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  1. 123456
  2. 123456789
  3. picture1
  4. password
  5. 12345678
  6. 111111
  7. 123123
  8. 12345
  9. 1234567890
  10. senha

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4-digit passcode

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brute-force attacks

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10 × 10 × 10 × 10

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10,000

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4-letter passcode

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52 × 52 × 52 × 52

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7,311,616

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4-character passcode

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94 × 94 × 94 × 94

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78,074,896

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8-character passcode

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94 × 94 × 94 × 94 × 94 × 94 × 94 × 94

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6,095,689,385,410,816

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two-factor authentication

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password managers

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  • Credential Manager
  • Keychain�
  • 1Password
  • LastPass�
  • ...

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email

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encryption

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U I J T X B T D T 5 0

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T H I S W A S C S 5 0

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https://

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end-to-end encryption

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https://zoom.us/j/5551112222

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https://zoom.us/j/5551112222?pwd=######

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full-disk encryption

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automatic updates

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Homework

  1. Use a password manager
  2. Use two-factor authentication
  3. Use (end-to-end) encryption

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edx.org/cs50

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U I J T X B T D T 5 0

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This was CS50