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Privacy Protecting Technologies

Privacy Protecting Technologies. Technology: Value Neutral?. Does technology, on average, help or hinder personal privacy?. The Big Idea. We can use technology to improve privacy. Web Browsing. Ad-Subtract Bugnosis. Ad Subtract. “Search Sanity”. Advantages: Multiplatform Easy to debug

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Privacy Protecting Technologies

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  1. Privacy Protecting Technologies

  2. Technology: Value Neutral? • Does technology, on average, help or hinder personal privacy?

  3. The Big Idea • We can use technology to improve privacy

  4. Web Browsing • Ad-Subtract • Bugnosis

  5. Ad Subtract

  6. “Search Sanity”

  7. Advantages: Multiplatform Easy to debug Client/server Disadvantages: Doesn’t work with SSL Install footprint Need to parse HTML Ad Subtract: Client-Side Java Proxy

  8. Bugnosis

  9. Features: Browser helper object Accesses HTTP & HTTPS Downloads updates Designed for journalists Bugnosis

  10. Private Messaging • PGP – first generation • Hush Mail – web based • The Martus Project – application specific • Disappearing Ink (Omniva) - Deletion

  11. PGP • Add-on • Plug-in • S/MIME vs. OpenPGP • Political Baggage

  12. Hush Mail • Second-generation • Web-based • Java Crypto Client

  13. Hush Mail

  14. Hush Mail

  15. Hush Mail

  16. Hush Mail

  17. Hush Mail Interface

  18. HushMail Diagram

  19. Disappearing Ink / Omniva • Self-destructing email for people who want to use it. • Why bother? Because it’s hard to delete things

  20. Email gets copies a lot

  21. Mix-Nets, Web & IP transport • Chaum’s mix-net scheme • The big idea: anonymity needs company • 1 mix: you trust the mixer • More mixes -> Less Trust • Mixing needs to be in space and time

  22. Practical applications of mixers: • Anonymous Remailers • Anonymous Browsing • Anonymous Publishing

  23. Anonymous Remailers • Anonymous posting on Usenet • anon.penet.fi • Based in Finland • Operated by Julf Helsingius • 70,000 registered users; 10,000 messages/day • February 1995 – Church of Scientology demands the True Name of a nym an144108@anon.penet.fi • Revealed on February 8 to belong to tc@alumni.caltech.edu under order from Finish Court • (Information applied to the Finish court had apparently been somewhat misleading) • August 30 – After second court case, anon.penet.fi shut down • full details at www.xs4all.nl/~kspaink/cos/rnewman/anon/penet.html

  24. Craig’s List

  25. Key features of an anonymous remailer • Strips identity from messages passing through • Provides mapping of nyms to “true names” • But only if replies are important • Optional: • Mixing - only if traffic in and out is observable • Encryption -

  26. Anonymous Web Browsing • Web Caches • Anonymizer • Anonymous Transport Services: • Freedom • Onion Routing

  27. Web Caches cache-ntc-ah12.proxy.aol.com - - [10/May/2003:22:47:31 -0400] "GET /clips/1999.TR.LCS35-FountainOfIdeas.pdf HTTP/1.0" 200 65536 "http://aolsearch.aol.com/aol/search?query=fountain+ideas&page=2" "Mozilla/4.0 (compatible; MSIE 6.0; AOL 7.0; Windows NT 5.1; .NET CLR 1.0.3705)“ cache-ntc-ah12.proxy.aol.com - - [10/May/2003:22:47:39 -0400] "GET /clips/1999.TR.LCS35-FountainOfIdeas.pdf HTTP/1.1" 206 688128 "-" "Mozilla/4.0 (compatible; MSIE 6.0; AOL 7.0; Windows NT 5.1; .NET CLR 1.0.3705)“ cache-ntc-ah12.proxy.aol.com - - [10/May/2003:22:47:44 -0400] "GET /clips/1999.TR.LCS35-FountainOfIdeas.pdf HTTP/1.1" 206 1024 "-" "Mozilla/4.0 (compatible; MSIE 6.0; AOL 7.0; Windows NT 5.1; .NET CLR 1.0.3705)“ cache-ntc-ah12.proxy.aol.com - - [10/May/2003:22:47:47 -0400] "GET /clips/1999.TR.LCS35-FountainOfIdeas.pdf HTTP/1.1" 206 75 "-" "Mozilla/4.0 (compatible; MSIE 6.0; AOL 7.0; Windows NT 5.1; .NET CLR 1.0.3705)“ cache-ntc-ah12.proxy.aol.com - - [10/May/2003:22:47:52 -0400] "GET /clips/1999.TR.LCS35-FountainOfIdeas.pdf HTTP/1.1" 206 725650 "-" "Mozilla/4.0 (compatible; MSIE 6.0; AOL 7.0; Windows NT 5.1; .NET CLR 1.0.3705)"

  28. Cache with anonymity

  29. Anonymizer

  30. Anonymizer.com rewrites URLs <td width=90 style='background:aqua; text-align:center; font:bold; font-family:Arial'> <a href='http://anon.free.anonymizer.com/http://www.simson.net/photos.php' title='Photos by and of Simson Garfinkel'> Photos </a> </td> <td width=90 style='background:lime; text-align:center; font:bold; font-family:Arial'> <a href='http://anon.free.anonymizer.com/http://www.simson.net/pubs.php' title='Publications, both academic and journalistic.'> Pubs </a> </td> <td width=90 style='background:magenta; text-align:center; font:bold; font-family:Arial'> <a href='http://anon.free.anonymizer.com/http://www.simson.net/projects.php' title='Current projects'> Projects </a> </td>

  31. Private IP Transport • Onion Routing • Freedom

  32. Freedom

  33. Unresolved Issues • How do you buy a book anonymously?

  34. [Anonymous] Publication Systems • anon.penet.fi was really about the right to anonymous publication on Usenet (1996) • Napster (1999 – 2001) • Freenet

  35. References: • EPIC Online Guide to Privacy Protecting tools: • http://www.epic.org/privacy/tools.html

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