Apple denies giving a list of iOS unique device identifiers (UDIDs) to the FBI, according to a statement issued on Wednesday. The statement follows previous claims from an Anonymous-offshoot group named AntiSec that a list of 12 million UDIDs were found on an FBI agent's laptop, though the FBI itself has also denied collecting that information.

"The FBI has not requested this information from Apple, nor have we provided it to the FBI or any organization. Additionally, with iOS 6 we introduced a new set of APIs meant to replace the use of the UDID and will soon be banning the use of UDID,” Apple spokesperson Natalie Kerris told All Things D on Wednesday.

AntiSec leaked one million UDIDs to the Web on Tuesday with promises to publish 11 million more sometime in the future. The group claimed to have obtained the list by hacking into FBI Supervisor Special Agent Christopher K. Stangl's data in March 2012 using a Java vulnerability, AtomicReferenceArray. But the FBI says it has found no evidence of such data collection, according to a statement issued Monday. The FBI has also issued vehement denials on Twitter: "Statement soon on reports that one of our laptops with personal info was hacked. We never had info in question. Bottom Line: TOTALLY FALSE," the FBI's press office wrote.

Regardless of whether the FBI was collecting the data or not, a witch hunt has begun to find the real culprit of the leak—widely suspected to be a social networking company of some kind. Developer Frederic Jacobs has posted a survey for those who have found their UDIDs on the leaked list (and yes, the UDIDs do appear to be valid) in an attempt to find out where the data came from.

Though the UDID by itself doesn't expose much information about you, there's plenty of information floating around that can associate a UDID with other behavioral data. As such, privacy advocates are still concerned about the origin of the information—for more info, check out our just-published Ask Ars on why the UDID seems to be such a big deal.