3.31.privacy - Privacy CS 161 - Computer Security Profs....

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Privacy CS 161 - Computer Security TAs: John Bethencourt, Erika Chin, Matthew Finifter, Cynthia Sturton, Joel Weinberger http://inst.eecs.berkeley.edu/~cs161/ March 31, 2010
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Announcements • Reminder: on Friday go to 1 Pimental , not here, for Midterm #2 – 5:10-6:30PM – You can bring a single page “cheat sheet” • Plus you can also bring the cheat-sheet from Midterm #1 • Note: no section next week
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Defining Privacy • Privacy = right to control who knows certain aspects about you / your communications / your activities – Control over disclosure – And ideally over subsequent use • How much of an issue is this? E.g., how much information about you do web sites learn as you surf?
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• The sites you visit learn: – The URLs you’re interested in • Google/Bing also learns what you’re searching for – Your IP address • Can often link you to other activity including at other sites – Your browser’s capabilities, which OS you run, which language you prefer – Which URL you looked at that took you there • Via “ Referer z! header
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• Oh and also cookies. • Cookies = state that server tells browser to store locally – Name/value pair, plus expiration date • Browser returns the state any time visiting the same site • Where’s the harm in that? And are these used much anyway?
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Let’s remove all of our cookies
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We do a Google search on “private browsing” And we click on the top result
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Note that this mode is privacy from your family , not from web sites!
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What on earth is Google tracking in this one? It sticks around for 6 months Whoa - we gained 11 cookies!
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Hmmm. Mozilla is tracking us too. And for 5 years!
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They’re even remembering just how we visited them
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And something else (as we’ll see in a bit) until the End Of Time
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(MY IP Address) Without doing anything else, we’ve gained a 12th cookie …
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We now do just one more operation, opening the home page of www.nytimes.com
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who’s that? And how did it get
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3.31.privacy - Privacy CS 161 - Computer Security Profs....

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