Protesters in "Guy Fawkes" masks favored by the Anonymous hackers group pose at a demonstration in February.
STORY HIGHLIGHTS
- Hackers post 1 million iPhone, iPad IDs they say are from FBI
- Antisec is a politically minded branch of the activist collective Anonymous
- The group's claim has not been independently confirmed
- FBI: There's no evidence that the claims are true
(CNN) -- The FBI on Tuesday said there is "no evidence" to support claims by a hackers group that they accessed information about millions of Apple users on a bureau computer.
The hackers have posted online what they claim are the IDs of more than 1 million iPhones and iPads. And they say that's just part of the more than 12 million IDs -- and other information such as users' names, cell phone numbers and billing addresses -- they got from the laptop of an FBI agent.
The release, if authentic, sparked a flurry of headlines Tuesday and raised questions about both FBI security and why the bureau would have collected that information about people in the first place.
Antisec, a politically minded branch of the hacker collective Anonymous, posted the ID numbers on Monday. If cross-referenced with info available to Apple developers, they could theoretically help someone find more specific details about the device's owner.

The telephone has come a long way from the 1930s, when rotary dial models such as the one pictured here were popular, to the iPhones and BlackBerrys we carry today. Click through to see a visual history of the telephone.
Alexander Graham Bell invented the liquid transmitter circa 1876.
This phone box in Southwark Bridge, London, features a wall-mounted phone with separate mouthpiece and receiver from 1924.
The rotary phone in this 1930s Reading, Pennsylvania, police box could be usd to summon police, ambulance or fire services at a moment's notice.
Rotary dial telephones with separate mouthpieces and receivers are commonly reffered to as "candlestick" phones. This model from the mid-1930s features the rotary dial in the shaft of the telephone, rather than the base-dial models with which most people are familiar.
This 1950s rotary phone features an attached mouthpiece and receiver.
Men of the English Oxfordshire and Buckinghamshire Light Infantry call their loved ones after being told to prepare for duty in the Suez Canal Zone in 1956. Payphones were common up until the cell phones became popular and affordable.
Some of the first push-button phones are pictured here in 1971.
Franck Piccard of France talks on his mobile phone after the Mens Super G Slalom event at the 1988 Winter Olympic Games in Calgary, Alberta.
This model of mobile phone was marketed by Racal-Vodac Limited of Newbury, Berkshire, England, in 1997, to serve dual roles as a mobile unit installed in a car or as a portable unit. The unit was sold with a battery charger and extension antenna for use in areas with poor reception.
Cell phone manufacturers made great strides between 1997 and 2004. The Palm Treo 600 smartphone, pictured here in 2004, integrated telephone with e-mail and Internet browsing capabilities.
Motorola's MPx wireless device, released in the second half of 2004, took the smartphone to a new level with Wi-Fi capabilites and a fully functional keyboard.
The first generation Apple iPhone, released on June 29, 2007, had people lining up for days before and after its release. It was an advancement in the world of smartphones, incorporating a touchscreen, apps, telephone, e-mail and a host of other features.
The iPhone 4S, released on October 14, 2011, expanded on the iPhone's innovations with the addition of groundbreaking retina diplay technology and SIRI.
The BlackBerry Bold 9930, shown here, continues a long line of BlackBerry devices so popular they have commonly been dubbed "crackberries." They are also popular smartphones for business applications because of their fully functional keyboards and advanced e-mail capabilities.
The original Motorola Droid was the thinnest of its kind at its 2011 release. Motorola's Droid Razr Maxx, on display at the 2012 International Consumer Electronics Show in Las Vegas, has a longer battery life than previous models.
A visitor uses a Samsung Galaxy S III smartphone during a press day at the Samsung stand at the IFA 2012 consumer electronics trade fair on August 30, 2012 in Berlin. Last year Samsung's Galaxy S III overtook Apple's iPhone 4S to become the world's best-selling smartphone for the third quarter, according to research by Strategy Analytics.
The iPhone 5 looks similar to previous models but has a larger screen and is lighter and thinner than the iPhone 4S. The phone also comes with a faster processor called the Apple A6, which connects to mobile carriers with a 4G LTE connection, making for speedier Internet browsing.
BlackBerry CEO Thorsten Heins displays the two new Blackberry 10 smartphones at the BlackBerry 10 launch event on Wednesday, January 30 in New York. The Z10, left, features an all-touch keyboard. The Q10 features a classic BlackBerry tactile keyboard.
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
A visual history of the telephone
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The post claimed that hackers exploited a vulnerability in the programming language Java on the computer of Special Agent Christopher K. Stangl, who specializes in cybersecurity.
The FBI responded Tuesday afternoon.
"The FBI is aware of published reports alleging that an FBI laptop was compromised and private data regarding Apple UDIDs (unique device IDs) was exposed," according to an FBI spokesperson. "At this time there is no evidence indicating that an FBI laptop was compromised or that the FBI either sought or obtained this data."
As of Tuesday afternoon, there had been no independent verification that the IDs came from an FBI computer. Apple did not respond to a request for comment.
"We don't have any way of confirming the source of the data, or what else might have been taken, but it does appear that the files do contain at least some genuine Apple UDIDs," said Graham Cluley, a senior tech consultant at Sophos Security. "Certainly things would be worse if the personal info was also released. But at the moment it feels as if the hackers might be more interested in embarrassing the FBI and causing mischief than putting innocent users at risk."
Because of the secretive nature of what they do, as well as the lack of any official organizational structure, no official spokesperson for Antisec or Anonymous came forward to take credit for the hack.
But Monday's post on document-sharing site Pastebin refers readers to a Twitter feed considered a reliable source of Anonymous information. On it, the user, or users, took credit for the post.
"Pleased to see, media actually asking the right question: Why the hell does an FBI agent have a database with 12M Apple UDID on his laptop?" read one tweet Tuesday.
The group claimed the document had been viewed 370,000 times in less than 24 hours.
In the document, the hackers criticize a government they claim uses hackers internally while actively prosecuting private citizens who do the same things for their own purposes. The group also includes messages of support for alleged hackers being prosecuted, such as Wikileaks founder Julian Assange as well as for Pussy Riot, the punk rock protesters jailed in Russia for a stunt criticizing President Vladimir Putin.
In their typical gonzo style, the Anonymous hackers' post combined a political credo with offbeat antics. Among them: an offer to grant interviews about their hack if Adrian Chen, a Gawker reporter who has written about Anonymous, is portrayed on the main page of Gawker for a full day wearing a ballet tutu and a shoe on his head. ("Put Shoe on Head" is an Internet meme that originated on 4chan, a home base of sorts for many who claim allegiance to Anonymous).
For his part, Chen actually seemed to be pondering the offer, if highly skeptical.
"How can I be sure Anonymous will hold up their part of the deal? Shadowy outlaw hacker groups are not known for their integrity," he wrote Tuesday. "I'm currently trying to gain certain assurances. Stay tuned for tutu-age."