How to Truly Browse in Private
All the modern browsers (Internet Explorer, Firefox, Chrome, etc...) come with what has affectionately been dubbed "porn mode." Though it goes by different names in different browsers (InPrivate, Private Browsing, Incognito), the idea is the same; they keep your online journeys hidden by deleting or rejecting cookies, not tracking history, and emptying the cache when you quit. Unfortunately, these tricks only solve part of the privacy equation, and dedicated snoops could still see what sites you're visiting. Geeky productivity blog Lifehacker has put together a great guide that exposes how these private browsing modes fail to truly cover your tracks, and how to better hide your browsing habits (for whatever reasons you might have).
The big problems are the DNS cache and Flash cookies, neither of which are covered by browsers' privacy controls. DNS, which is often described as the Internet equivalent of a phone book, translates Web site names (such as Switched.com) into IP addresses (e.g., 127.0.0.1). These IP addresses are saved locally to speed up access to those pages in the future. Private browsing modes don't clear this cache, which means that somebody could tell what sites you'd been visiting just by looking at locally stored IP addresses, even if you'd cleared your browser history.
The big problems are the DNS cache and Flash cookies, neither of which are covered by browsers' privacy controls. DNS, which is often described as the Internet equivalent of a phone book, translates Web site names (such as Switched.com) into IP addresses (e.g., 127.0.0.1). These IP addresses are saved locally to speed up access to those pages in the future. Private browsing modes don't clear this cache, which means that somebody could tell what sites you'd been visiting just by looking at locally stored IP addresses, even if you'd cleared your browser history.
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