Firesheep session hijacking tool makes public Wi-Fi useless

At the Toorcon 12 hacker conference in San Diego on Sunday, Seattle programmer Eric Butler introduced his Firesheep add-on for the Firefox Web browser in an effort to bring attention to the weakness of open Wi-Fi networks. In a practice known as HTTP session hijacking (or “sidejacking”) the add-on intercepts browser cookies used by many sites, including Facebook and Twitter, to identify users and allows anyone running the program to log in as the legitimate user and do anything that user can do on a particular website.

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