CS50 Cybersecurity - Lecture 4 - Preserving Privacy

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This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming.

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TABLE OF CONTENTS

00:00:00 - Introduction
00:00:17 - Preserving Privacy
00:01:15 - Web Browsing History
00:03:54 - Logs
00:06:36 - HTTP headers
00:16:47 - Fingerprinting
00:26:35 - Session Cookies
00:31:00 - Tracking Cookies
00:33:54 - Tracking Parameters
00:39:22 - Third-Party Cookies
00:49:10 - Private Browsing
00:51:40 - Supercookies
00:58:01 - DNS
01:03:21 - DNS over HTTPS
01:04:21 - DNS over TLS
01:06:59 - Virtual Private Network (VPN)
01:10:14 - Tor
01:14:09 - Permissions
01:15:43 - Location-Based Services

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LICENSE

CC BY-NC-SA 4.0
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

David J. Malan

[isudrnp]

Many thanks to Harvard, CS50, and especially Professor David Malan for offering this fantastic course on Cybersecurity. I've acquired a wealth of knowledge from these lectures. May Allah bless you! 🙏

[FootballMasterpiece.]

Divine things always ending 😭😭😭😭😭 I'll miss you CS50 Cybersecurity and hello CS50 SQL 😈

[lukecartwright]

10 minutes in and I've already learnt so much!! David is an incredible teacher!

[sebastianarellano]

Thank you so much David and all team included. Fantastic course

[Michael-lbhh]

Thank you David and the rest of the CS50 team!

[devabdee]

Thank you so much Havard, CS50 & esp David malan Sir for this awesome cousre. Learned alot from these intro level lectures. May Allah bless you :)

[tirthrajmahajan]

Just completed the entire course! I would like to thank Harvard, CS50 and Prof. Malan for such an amazing course. This course gave a nice overview over the field of Cybersecurity! It took me 1.5 months to completely understand and research all the topics Prof. Malan covered throughout this course. Of course this was just an introduction, but I am glad to have cleared all the fundamentals!

[mantvydasliobe]

1:15 Web Browsing History
4:01 Logs
6:37 HTTP headers
16:37 Fingerprinting
18:47 User-Agent
26:46 Session Cookies
31:02 Tracking Cookies
33:57 Tracking Parameters
39:22 Third-Party Cookies
49:12 Private Browsing
51:41 Supercookies
58:05 DNS
1:03:27 DNS over HTTPS(DoH)
1:04:25 DNS over TLS (DoT)
1:07:00 Virtual Private Network (VPN)
1:10:15 TOR
1:14:09 Permissions
1:15:48 Location-Based Services

[MusashiOfRings]

I would like to add that while TOR is useful, that many governments have been setting up many, many TOR nodes in order to control entry and exit points and potentially track users. In its early days it was useful for people under authoritarian governments to communicate more freely, however now it does not offer the same protection from state-based actors. This should be factored into one's threat model when creating your security plan.

[SenzoShinga]

finally done now i'm heading to the final project which must be a video, i have learnt a lot i have watched all the lectures and failed two assignments i'm going to rewrite until i pass. I hope i will finish and get the certificate but most importantly the knowledge.... I'm in South Africa, do we have any South Africans here?

[avijeetupadhyaya]

Some in our curriculum and some new thanks

[avijeetupadhyaya]

I watch all lecture till here quite good

[kossboss]

I wonder why all of the HTTP versions he is showing is HTTP/3. Maybe its an easter egg. If im not mistaken that is a newer protocol still in design or early adoption that actually encrypts all communication by default (essentially removing the need for HTTPS to encrypt) and also operates on UDP instead of TCP. Websites can implement it right now. However definitely most sites still operate with HTTP/1.1 and HTTP/2. After all, HTTP/2 is still not fully adopted by all websites; I doubt it will be in the near future.

[DanyloYoutubylo]

all lectures are great, but the audience questions, I must say, could be skipped :D

[advertsharing]

Can you offer courses in artificial intelligence?

[mostafa-xquk]

where's the rest of the videos please?