A group working under the banner of Anonymous has succeeded in bringing down the ICO's website with a suspected DDoS attack.
The privacy watchdog's site was down for all of yesterday after a group identifying with the collective dealt its blow.
According to a Tumblr page, the team - calling itself Anon A Team - targeted the privacy watchdog because they believed it lacked independence and had repeatedly failed "to protect the public’s privacy from hacking or data protection breaches."
It also claimed that the law protecting privacy was "inadequate and with disproportionate measures in relation to political protests but none for the civil service or media," as well as a systematic bias in the way the press reports public interest stories - as a consequence of its failure to give sufficient weight to certain stories.
"There is zero commitment by all our regulators to protect UK citizens from data protection breaches," it continued.
The group described the Leveson inquiry as a "farce".
The sentiments were echoed in an interview at TechWeek Europe, where someone claiming to be affiliated with Anonymous said the watchdog was not "equipped, nor have the motivation to ensure that we are protected".
The attack was met with mixed feelings by the security industry with many refusing to comment.
However, one security professional did speak with TechEye under anonymity. "Hackers are far cleverer than heads of states, government bodies and companies," the source said. "No matter how much security is in place, if Anonymous wants to take you down, it will.
"Do I agree with this attack? They do have a point about privacy," the source said.
The ICO itself refused to speak beyond issuing a generic statement:
“Access to the ICO website has been disrupted over the past few days. We believe this is due to a distributed denial of service attack. The website itself has not been damaged, but people have been unable to access it. We provide a public facing website which contains no sensitive information.
“We regret this disruption to our service; however we are pleased that our website is now available.”