In the USA, the Subcommittee on Commerce, Manufacturing and Trade of the U.S. House of Representatives Committee on Energy and Commerce held a hearing in Washington, DC on “The Threat of Data Theft to American Consumers.” They asked Sony questions on the cyber attack Sony and the PSN experienced. in reply, Sony's Kazuo Hirai submitted written answers to questions Sony were asked. The full 8 page response can be found here.
One important piece of information was released by Sony. they found a file planted on their servers named “Anonymous” with the words “We are Legion.”. this leads to speculation that in some way Anonymous were responsible for the attack.
Sony has reiterated that for now, no major credit card company has reported any fraudulent transactions as a result of the cyber attack. they have also reiterated that they did not know the scope of the attack until the 25th April, and they subsequently informed customers on the 26th April. but they do say all PSN user accounts were compromised in some way.
Sony have also confirmed they are taking steps to prevent future breaches. This includes enhancing levels of data protection and encryption; enhancing their ability to detect software intrusions, unauthorized access and unusual activity patterns; additional firewalls; the establishment of a new data center in an undisclosed location with increased security; and the naming of a new Chief Information Security Officer.
Source: USA Playstation Blog
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