The FBI on Tuesday denied that the Apple user ID data published by hacker collective Anonymous was obtained from FBI computers.
"The FBI is aware of published reports alleging that an FBI laptop was compromised and private data regarding Apple UDIDs was exposed," the agency said in a statement. "At this time, there is no evidence indicating that an FBI laptop was compromised or that the FBI either sought or obtained this data."
Earlier today, hackers operating under the AntiSec umbrella of Anonymous leaked more than 1 million Apple iPhone and iPad IDs (UDIDs), which the group said were obtained via FBI computers.
Despite the FBI's denial, Anonymous was not deterred.
"You know you're doing something right if @FBIPressOffice throws caps at you on twitter to deny an #Anonymous statement," the @AnonymousIRC Twitter feed wrote yesterday evening.
"Also, before you deny too much: Remember we're sitting on 3TB additional data. We have not even started. #funtimes #fff," the group posted a few minutes later.
However, security experts were sceptical.
"I personally think it is a PR scam by Anonymous," F-Secure security advisor Sean Sullivan said.
Similarly, Sophos has speculated that Anonymous was "more interested in embarrassing the FBI's team than endangering innocent users."
Anonymous has had a rather contentious relationship with the FBI and other government agencies. Hacker arrests are often met with DDoS attacks against the agencies' websites, or data dumps like the one carried out yesterday. In February, Anonymous leaked a phone call between the FBI and UK law enforcement where officials were heard discussing the cases of Anonymous members who were arrested for various hacks.