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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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Presentation Transcript
technology value neutral
Technology: Value Neutral?
  • Does technology, on average, help or hinder personal privacy?
the big idea
The Big Idea
  • We can use technology to improve privacy
web browsing
Web Browsing
  • Ad-Subtract
  • Bugnosis
ad subtract client side java proxy
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
bugnosis1
Features:

Browser helper object

Accesses HTTP & HTTPS

Downloads updates

Designed for journalists

Bugnosis
private messaging
Private Messaging
  • PGP – first generation
  • Hush Mail – web based
  • The Martus Project – application specific
  • Disappearing Ink (Omniva) - Deletion
slide13
PGP
  • Add-on
  • Plug-in
  • S/MIME vs. OpenPGP
  • Political Baggage
hush mail
Hush Mail
  • Second-generation
  • Web-based
  • Java Crypto Client
disappearing ink omniva
Disappearing Ink / Omniva
  • Self-destructing email for people who want to use it.
  • Why bother? Because it’s hard to delete things
mix nets web ip transport
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
practical applications of mixers
Practical applications of mixers:
  • Anonymous Remailers
  • Anonymous Browsing
  • Anonymous Publishing
anonymous remailers
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 [email protected]
    • Revealed on February 8 to belong to [email protected] 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
key features of an anonymous remailer
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 -
anonymous web browsing
Anonymous Web Browsing
  • Web Caches
  • Anonymizer
  • Anonymous Transport Services:
    • Freedom
    • Onion Routing
web caches
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)"

anonymizer com rewrites urls
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>

private ip transport
Private IP Transport
  • Onion Routing
  • Freedom
unresolved issues
Unresolved Issues
  • How do you buy a book anonymously?
anonymous publication systems
[Anonymous] Publication Systems
  • anon.penet.fi was really about the right to anonymous publication on Usenet (1996)
  • Napster (1999 – 2001)
  • Freenet
references
References:
  • EPIC Online Guide to Privacy Protecting tools:
  • http://www.epic.org/privacy/tools.html
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