Ed Felten has posted an intriguing rumination on the possible failure modes of Bayesian spam-filtering -- filtering that uses word-frequency statistics to classify email as spam or ham. As Ed points out, Bayesian filters are trained by the spammers, who, by choosing the vocabulary of their messages carefully, can make messages containing certain words or phrases undeliverable on the Internet.
Now suppose a big spammer wanted to poison a particular word, so that messages containing that word would be (mis)classified as spam. The spammer could sprinkle the target word throughout the word salad in his outgoing spam messages. When users classified those messages as spam, the targeted word would develop a negative score in the users' Bayesian spam filters. Later, messages with the targeted word would likely be mistaken for spam.
This attack could even be carried out against a particular targeted user. By feeding that user a steady diet of spam (or pseudo-spam) containing the target word, a malicious person could build up a highly negative score for that word in the targeted user's filter.
The Cobham catalog, exposed by The Intercept, features countless pages of surveillance gadgets sold to U.S. police to spy on American citizens: tiny black boxes with a big interest in you. In the creepily bland feature lists and nerdy product names is a whisper of a dark future; perhaps darker than anyone can imagine.
This image depicts the most commonly-found stylesheet colors on the web’s top sites—Paul Hebert did an amazing amount of analysis and this is just one of the intriguing visualizations he came up with. Most of these are obvious staples, especially HTML red and blue, though it’s interesting how far the blue “cluster” is from the […]
With the cacophony of an election year ablaze with unparalleled drama being fought on the front lines of Twitter, we find ourselves slowing down and staring at it like a bad accident. The need for escapist relief is perhaps more dire than usual right now. This fall, if it’s drama you crave, but the Hillary […]
When you’ve had a long day and it’s time to unwind, there’s a lot you can do to relax: drink some tea, take a shower or even read a book. But there’s one thing that’s essential to a comfortable night’s rest—and that’s investing in some really good sheets. Enter Bamboo Bed Sheets. These quality sheets retail for $120, but […]
The Avantree Powerhouse 4 Port Fast USB Charging Station brings high quality, high power, and still keeps your work space or home looking neat and organized. The best part about this charger is its capacity. It comes packing 4 USB charging sockets and a powerful 4.5A/22.5W output.. Its smartport technology means you don’t have to worry about frying your battery, either—it […]
With this comprehensive course in App & Game Development for iOS and Android, you’ll be able to take full advantage of this career opportunity without committing to going back to school full time. You’ll learn how to build immersive, interactive games and apps from start to finish using Python, C#, Unity, and HTML—some of the most in-demand programming […]