CS283 - Lecture 6 - Part 3 - Additional Topics - Privacy and Anonymity

CS283 - Lecture 6 - Part 3 - Additional Topics - Privacy and Anonymity

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12/05/09 CS283- 172/Fall06/GWU/Vora/Identity 1 GWU CS 172/283 Autumn 2009 Lecture 6 Part 3 - Additional Topics – Privacy and Anonymity
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2 Cookies Can be thought of as Post-it notes for the web (typically 4KB) Small files maintained on user’s hard disk, readable only by the site that created them (up to 20 per site) Used to Preserve state information about a transaction identify you when you return to a web site so you don’t have to remember a password help web sites understand how people use their services (e.g. doubleclick) Cookies can be harmful used to profile users and track their activities without their knowledge, especially across web sites Cookies Can be disabled To learn about cookies, see Cookie Central at http://www.cookiecentral.com/index2.html GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 3 - Rev 20091117
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3 How DoubleClick Works DoubleClick Server Merchant Server e.g. Altavista Client Web Page 1. Client requests a page 2. Server sends a page with a DoubleClick URL 4. Client requests the DoubleClick page 3. Text is displayed 5. DoubleClick reads its cookie 6. DoubleClick decides which ads to send If you choose to give u personal information via the Internet that we or our business partners may need -- to correspond with you, process an order or provide you with a subscription, for example -- it is our intent to let you know how we will use such information. If you tell us that you do not wish to have this information used as a basis for further contact with you, we will respect your wishes. We do keep track of the domains from which people visit us. We analyze this data for trends and statistics, and then we discard it. Merchant Cookie DoubleClick Cookie GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 3 - Rev 20091117
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4 Privacy We take privacy in our daily lives for granted In the Internet that is not the case Recent historical examples: Pentium III chip serial numbers Read via software (ActiveX or Applets) Helps track a user over the web After pressure from privacy activists Intel decided to turn it off by default Could be turned on by software Not included in later chip designs from Intel due to backlash GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 3 - Rev 20091117
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5 Privacy Cookies Used to keep a track of the sites you visit double-click and other advertising agencies are main employers of cookies Carnivore sniffer Employed by the FBI Sniffs email, installed at ISP or in LAN Emails can be scanned in real time Supposed to obtain warrant to do this You could encrypt your message Abandoned circa 2005 in favor of commercial product alternatives GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 06 – Part 3 - Rev 20091117
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6 Platform for Privacy Preferences (P3P) P3P Developed by the World Wide Web Consortium It is a protocol allowing users to interrogate websites about privacy A P3P-enabed site posts a machine-readable privacy policy summary (IBM P3P editor)
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CS283 - Lecture 6 - Part 3 - Additional Topics - Privacy and Anonymity

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