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No boundaries for user identities: Web trackers exploit browser login managers In this second installment of the “No Boundaries” series, we show how a long-known vulnerability in browsers’ built-in password managers is abused by third-party scripts for tracking on more than a thousand sites. by Gunes Acar, Steven Englehardt, and Arvind Narayanan We show how third-party scripts exploit browsers’ bu
There’s an ongoing arms race between ad blockers and websites — more and more sites either try to sneak their ads through or force users to disable ad blockers. Most previous discussions have assumed that this is a cat-and-mouse game that will escalate indefinitely. But in a new paper, accompanied by proof-of-concept code, we challenge this claim. We believe that due to the architecture of web bro
Gone In Six Characters: Short URLs Considered Harmful for Cloud Services [This is a guest post by Vitaly Shmatikov, professor at Cornell Tech and once upon a time my adviser at the University of Texas at Austin. — Arvind Narayanan.] TL;DR: short URLs produced by bit.ly, goo.gl, and similar services are so short that they can be scanned by brute force. Our scan discovered a large number of Microso
The first complete draft of the Princeton Bitcoin textbook is now freely available. We’re very happy with how the book turned out: it’s comprehensive, at over 300 pages, but has a conversational style that keeps it readable. If you’re looking to truly understand how Bitcoin works at a technical level and have a basic familiarity with computer science and programming, this book is for you. Research
There have been rumors for years that the NSA can decrypt a significant fraction of encrypted Internet traffic. In 2012, James Bamford published an article quoting anonymous former NSA officials stating that the agency had achieved a “computing breakthrough” that gave them “the ability to crack current public encryption.” The Snowden documents also hint at some extraordinary capabilities: they sho
Josh wrote recently about a serious security bug that appeared in Debian Linux back in 2006, and whether it was really a backdoor inserted by the NSA. (He concluded that it probably was not.) Today I want to write about another incident, in 2003, in which someone tried to backdoor the Linux kernel. This one was definitely an attempt to insert a backdoor. But we don’t know who it was that made the
Today eight colleagues and I are releasing a significant new research result. We show that disk encryption, the standard approach to protecting sensitive data on laptops, can be defeated by relatively simple methods. We demonstrate our methods by using them to defeat three popular disk encryption products: BitLocker, which comes with Windows Vista; FileVault, which comes with MacOS X; and dm-crypt
Remember last week’s kerfuffle over whether the movie industry could own random 128-bit numbers? (If not, here’s some background: 1, 2, 3) Now, thanks to our newly developed VirtualLandGrab technology, you can own a 128-bit integer of your very own. Here’s how we do it. First, we generate a fresh pseudorandom integer, just for you. Then we use your integer to encrypt a copyrighted haiku, thereby t
CITP Blog is hosted by Princeton University’s Center for Information Technology Policy, a research center that studies digital technologies in public life. Here you’ll find comment and analysis from the digital frontier, written by the Center’s faculty, students, and friends.
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