'Relentless' pace of hack attacks
On average the unprotected website was attacked more than 2,000 times per week and the protected site more than 200 times.
Many of the attacks were rated as "high risk" and, if the websites were real, could have seen data destroyed or important customer information stolen.
The two dummy sites were set up by net provider PSINet and security firm PanSec International to demonstrate the relentlessness of online malicious hack attacks.
The fake websites were made to look like they were operated by European banks. One was protected with a standard firewall but the other was left almost defenceless.