The corporate networks of finance firms based in the City are at risk because Wi-Fi networks in the Square Mile still lack basic levels of security, experts have warned.
Businesses’ internal resources such as printer queues could be found quite easily, while other corporate networks used only weak WEP security to keep traffic from prying eyes, said security testing company NTA Monitor, which recently assessed security using passive monitoring.
Some networks used no encryption at all, the security firm found.
NTA technical director Roy Hills said: "If a stranger walks into an office and connects to your network, it's quite likely that they'd be challenged by someone working there.
“But by sitting in a café with a laptop they're pretty inconspicuous and probably out of sight of the office whose network they're connecting to. For a malicious user wishing to connect to a corporate network, the City seems to be an ideal location.”
NTA did not give a breakdown of the specific security problems found or the companies affected.
For more information, our sister site Techworld has a comprehensive network security resource page.