The Corporate IT Forum (formerly known as The Infrastructure Forum) has formed a security group to work with the police on hacking and viruses.
The group plans to help the police with high-tech criminal prosecutions without companies having to release proprietary secrets or suffer damage to individual brands.
David Roberts, chief executive at the Corporate IT Forum, said: "Historically companies have been discouraged from sharing information.
"Now, when the chips are down we can all work together and solve problems a lot faster, be they viruses or actual malicious intrusion."
The group is keen to work with the UK's National High Tech Crime Unit (NHTCU), set up by the government in November 2000. Work is going on in the US to form a similar group to work with the new Office of Homeland Security.
A spokeswoman for the NHTCU said that it was keen to form partnerships to crack down on high-tech criminal activity.
"We welcome any organisation that will work with us in targeting high-tech crime," she said. "This is a global problem requiring a global solution and building partnerships is a massive step in reaching that solution."
The Corporate IT Forum has members from 47 of the FTSE 100 companies, and is aimed at improving response times to problems and addressing continuing vulnerabilities in IT infrastructures.
A 2002 Department of Trade and Industry report found that 78 per cent of companies had suffered an online attack, with the average cost standing at £30,000.
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