Infamous hacking group LulzSec is claiming to have obtained the entire 2011 UK Census records, which amounts to the personal details of every UK citizen, according to a document posted to Pastebin.
The group has yet to confirm the authenticity of the document via its official Twitter account, but if true it could be the biggest data breach to date for the collective, which has managed to break the security systems of Sony, Nintendo and others in recent weeks.
"We have blissfully obtained records of every single citizen who gave their records to the security-illiterate UK government for the 2011 census," the statement reads.
"We're keeping them under lock and key though... so don't worry about your privacy (...until we finish re-formatting them for release)."
The move could be part of the LulzSec's Operation Anti-Security campaign, apparently set up with Anonymous this week.
"Our next step is to categorise and format leaked items we acquire and release them in #AntiSec 'payloads' on our web site and The Pirate Bay," the group said in its most recent tweet.
As if to confirm this, the Pastebin statement ended with a promise to "embark upon a trip to ThePirateBay" with the Census records "for your viewing pleasure".
It still, however, remains to be seen whether the news is a hoax.
"Here at Sophos we're assuming the LulzSec/UK Census story *isn't* true until we see more evidence than that Pastebin url. Fingers crossed," tweeted Sophos senior technology consultant Graham Cluley.
UPDATE: LulzSec has since issued a tweet denying any involvement in this particular hack.
"Just saw the pastebin of the UK census hack. That wasn't us - don't believe fake LulzSec releases unless we put out a tweet first," it read.
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