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Private browsing modes in four biggest browsers often fail

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Moz/FF

Features in the four major browsers designed to cloak users' browser history often don't work as billed, according to a research paper that warns that users may get a false sense of security when using the built-in privacy settings.

The private-browsing modes are supposed to allow users to visit a website without leaving any trace on their computers, and yet Internet Explorer, Firefox, Chrome, and Safari frequently leave tracks, according to the research, which is scheduled to be presented at next week's Usenix Security Symposium in Washington DC. The makers of those browsers — Microsoft, Mozilla, Google, and Apple respectively — often hail the offerings as a way to enhance privacy when using shared computers.

One failure that affects IE, Firefox, and Safari happens when users save SSL, or secure sockets layer, client certificates while browsing in private mode. The browsers store a record of those actions in a file that allows anyone who has physical access to know exactly what site the user was visiting at the time. Similarly, when IE and Safari encounter a self-signed certificate, it is stored in a certificate vault that is preserved even after the private session ends.

Similarly, Firefox users who make security certificate settings while in private mode will have a partial copy of their browsing history stored in a file called cert8.db, the researchers said.

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