The suspects - from Doncaster, Warminster, Northampton and London - are being questioned by Scotland Yard's e-Crime unit.
Their arrests are part of a wider operation involving UK law enforcement and the FBI.
At the same time, 14 suspected members of Anonymous appeared in a US court.
Authorities around the world have been rounding up suspects following a wave of attacks by both groups on major corporations and government institutions.
Amazon, PayPal, the CIA, US Senate and the UK's Serious Organised Crime Agency have all suffered either intrusions or denial of service attacks, designed to take their websites offline. More...
A U.S. report that intruders breached the computer networks of 72 organizations around the world over a five-year period in the biggest hacking campaign found to date will be seized on by Western states to call for tougher digital defences.
"This is the biggest transfer of wealth in terms of intellectual property in human history," said Dmitri Alperovitch, vice president of Threat Research at U.S. security company McAfee, which produced the report.
McAfee said it believed there was one "state actor" behind the attacks but declined to name it, though one security expert who has been briefed on the hacking said the evidence points to China. There was no comment from China on the report. More...
The system includes an updated list of the top 25 programming errors that enable today’s most serious hacks. It adds new tools to help software programmers eliminate the most dangerous types of mistakes and enable organizations to demand and buy more secure products.
The effort to improve software security has been three years in the making, according to Robert A. Martin, principal engineer at Mitre, a technology nonprofit organization that conducts federal research in systems engineering.
The costs of flaws or omissions that make software susceptible to attack was highlighted by a number of recent attacks that resulted in the theft of credit card information, user names and passwords from government and banking sites.
During an online news conference, government officials pointed out that a wide range of stakeholders had an interest in seeing the top 25 errors addressed, and they stressed the need for better training and education for people writing software. More...
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