It seems like a market ripe for exploitation
It seems like a market ripe for exploitation
It surprised me when I ran a small business my bank didn't even require me to file the signatures up front. I just typed in peoples IBAN, the amount, and got it. They never asked for paperwork ever. Naturally, I didn't commit a crime, but I'm surprised with the trust.
So, yes, keep your IBAN secret, it can be enough for someone with criminal intent.
Worryingly, during Covid, a photo of a password was accepted as complete identification in many places (outside Sweden, domestically we have much better electronic ids).
So there is definitely some useful non public data you can steal.
As another comment notes a lot of information is either public or widely disseminated, eg in the US my address is public on the voter rolls and I give out my checking account number every time I write a check.