More than 33% of London businesses with wireless Lans are open to hacking, the research found. Last year researchers found only 15% of wireless networks were insecure.
Tim Pickard, RSA Security's vice-president of international marketing, said, "The research shows that corporate wireless networks in London are growing at an annual rate of 62%. And 36% of these businesses remain unprotected from attack."
The survey revealed that many businesses had failed to take basic security precautions such as reconfiguring their default network settings.
In London 26% of access points were found to have default settings. This means that wireless network access points were broad- casting information that could be used by hackers, said RSA.
Phil Cracknell, chief technology officer at netSurity and author of the study, said, "Accidental or intentional connection to a corporate network can bring with it a series of security issues, including loss of confidential data and installation of malicious code. Fuelled by the availability and abundance of public access hotspots, mobile users now expect to find and know how to use a wireless network."