A news story in today's Sydney Morning Herald caught my eye: "New software to beat credit card fraud". The story describes how National Australia Bank is rolling out new technology - called liquid encryption numbers (LEN) - developed at its Bank of New Zealand subsidiary to deal with card fraud.
Exploring a bit further, I found this BNZ page with more details about LEN. According to BNZ, "LEN updates the magnetic stripe security information on BNZ credit cards when a transaction is completed at a BNZ ATM. This technology allows us to automatically detect if your card has been copied or duplicated without your knowledge. "