Sony has implicated hacking group Anonymous as being behind the recent attacks on Sony's PSN
and Sony Online Entertainment services
, which have compromised the credit card details of millions of Sony customers. Several Sony services, on both PlayStation and PC, remain offline.
Sony boss Kaz Hirai made the implication in an open letter to the US House of Representatives subcommitte, which is (along with some other governments) investigating the attacks.
"We discovered that the intruders had planted a file on one of our Sony Online Entertainment servers named 'Anonymous' with the words 'We are Legion',
" said Sony's Patrick Seybold on the official PlayStation blog
Hirai's letter also confirmed that no fraudulent credit card activity has been reported following the attacks, indicating that the hacks were not motivated by financial gain.
Anonymous has denied involvement however, although it says it does 'have a beef' with Sony over the lawsuits bought against PS3 firmware breaker George 'Geohot' Hotz
Prior to the recent PSN attacks Anonymous insisted that it would not attack PSN out of a desire to wound Sony, not customers.
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