Kiwi banks have predictably reassured customers that their Internet banking is safe.
The pledge comes after Britain's Barclays Bank was forced to shut its online service last week because of a security breach.
Four customers who logged in last Monday found they were able to read details of other people's bank accounts.
Barclays says the problem was associated with a software upgrade that went live the previous weekend.
New Zealand banks contacted by Computerworld say their systems are safe.
ASB technology and operations head Garry Fissenden says the bank's Fastnet site has been designed to ensure a user can not read the bank details of another.
Since Fastnet was launched in 1997, its systems have operated without any significant trouble.
WestpacTrust says its systems regularly receive small upgrades, to avoid the type of problems associated with a major upgrade.
The bank's online service has also avoided "significant" problems serving its 35,000 customers.