''The protectors have to be 100 per cent perfect in their defence, while the attackers only need to find one tiny chink to get through,'' Professor Vaile said.
The Australian Bankers Association said banks were not aware of any fraud that has occurred on customer accounts following the PlayStation breach. However, some accounts are being closely monitored for suspicious activity.
"If fraud does occur as a result of this incident, then account holders are protected from loss," a spokeswoman said.
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