But before you can assess the trade-off, you have to know what elements are being traded off against each other. For example, at the Bundesbank, we have identified a trade-off between the need to use mobile devices and the need to use data sparingly; we now ask our staff to use mobile data only when necessary.
Second, there simply is no such thing as 100% cyber security. As a measure of defence, twofactor authentication is considered as best practice for online banking applications.