Sony said today that the hack that took down the Playstation Network and exposed some 77 million users' personal and credit card information was the work of the hacking group Anonymous. It's touting, as proof, a file called "Anonymous" that it found on one of its servers, which contained the words "we are legion," one of the group's catch-phrases. The company revealed the evidence on its Playstation Blog after its representatives testified about the security breach before a congressional committee.
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