Two leading banks are to send Chip and-Pin machines to the homes of hundreds of thousands of their online customers in a bid to cut fraud.
In the first move of its kind, Barclays bank will send at least 500,000 machines, similar to those used in shops, to customers who will need them to access accounts.
The Royal Bank of Scotland will launch a similar system in the summer.
About £33million was lost to online banking fraud nationwide last year, up from £12.2million in 2004.
Barclays said it would absorb the multi-million-pound set-up cost of the system, which will require customers to insert their debit card into the machine every time they want to log in.
After keying in their Pin number, an eight-digit, randomly generated number will appear on the machine's display, which will have to be typed in to access the account.
The same process will also be required to transfer money to third-party accounts not recognised by the bank.
Barclays plans to send out at least 500,000 of the machines to some of its 2million online customers but is prepared to provide more.
'This extra level of security is taking it away from the computer and we believe it will help enormously to protect customers from fraud,' said bank spokesman Andrew McDougall.
'Unless you actually have the card and the Pin you won't be able to hack in.'
The move has been welcomed by payments association Apacs. It said the most common form of fraud is 'phishing', where emails pretending to be from a bank asking for details are sent.