Jefferson's Wheel

Here’s another article on Adrienne Felt’s work on privacy issues with the Facebook platform: 90% of Facebook Apps Have Unnecessary Access to Private Data, Dark Reading, January 31, 2008.

UVa Today has an article about Adrienne Felt’s work on the privacy risks of the Facebook platform:
U.Va. Engineering School Student Probes Facebook’s Vulnerabilities, UVa Today, January 30, 2008.

Here are a few excerpts:

Facebook, the social networking platform that has redefined communications, has millions of users. According to University of Virginia computer science major Adrienne Felt, all of these users should be concerned about security.

Felt, a fourth-year student in the School of Engineering and Applied Science at U.Va., leads a research project on privacy issues surrounding social networking platforms and is investigating the information sharing that occurs when users download a Facebook application — a program that allows the user to interact with other users in interesting ways, from sharing music to playing games.

Although these applications add variety to a Facebook user’s profile page, they also increase the user’s vulnerability. Here’s how: anyone with an account on Facebook can create an application. Although this application appears as if it is part of Facebook’s platform, it is actually running on application developer’s server. When a user installs an application, that application’s developer is given the ability to see everything the user can see — name, address, friends’ profiles, photos, etc.

…

Felt’s goal is to make users more aware of how their private information is being used — and to close this privacy loophole.

She has developed a privacy-by-proxy system — a way for Facebook to hide the user’s private information, while still maintaining the applications’ functionalities. Under Felt’s system, at the point at which the Facebook server is communicating with the application developer’s server, the Facebook server would provide the outside server with a random sequence of letters instead of the user’s name (and other personal information).

Felt is working on refining the privacy-by-proxy design and building a prototype implementation. “This is the first step,” she said. “Hopefully, the research findings and proposed solution will trigger more responsible privacy and information management policies from social networking sites and will better inform users.”

The full article also includes an audio clip.

[Added 2 March] There is an audio version of this story on The Oscar Show: Privacy and Facebook, 27 February 2008.

Karsten Nohl, in collaboration with Starbug and Henryk Plötz, has reverse-engineered the encryption algorithm used in Mifare Classic RFID tags, and identified several serious weaknesses in the ciper design and the way it generated random numbers. Mifare tags are used in several large public transportation systems including London Transport’s Oyster cards, and the Dutch government was planning to used them for the nationwide OV-Chipkaart system, but is reconsidering this in light of the revealed security weaknesses. The work involved reverse engineering the cipher from images of its hardware implementation.

The results were announced at the Chaos Communication Congress (December 28). Here’s Karsten’s talk (including a link to a video): Mifare: Little Security, Despite Obscurity.

Some posts about this work include:

• Schneier on Security (Bruce Schneier), Dutch RFID Transit Card Hacked
• Freedom to Tinker (Ed Felten), New $2B Dutch Transport Card is Insecure.
• Andy Tanenbaum, Dutch Public Transit Card Broken (includes links to many Dutch newspaper articles).

Karsten will also be giving a talk about this work at the RFID Security Workshop at Johns Hopkins University, January 23-24.

Chris Soghoian’s blog on CNET.com has an article about Adrienne Felt’s work on privacy for web platforms with open APIs:  Exclusive: The next Facebook privacy scandal, c|net Blogs, January 23, 2008:

But a new study suggests there may be a bigger problem with the applications. Many are given access to far more personal data than they need to in order to run, including data on users who never even signed up for the application. Not only does Facebook enable this, but it does little to warn users that it is even happening, and of the risk that a rogue application developer can pose.

The report is available here:
http://www.cs.virginia.edu/felt/privacy/.