The man was trying to go around the paid telephone consumer support system and got from Internet forums what he thought was a direct-line to the central bank employees (yes, in France, you have to pay for most form of telephone support). When asked for a code by an automated system, he entered 123456 and it worked – he had just breached the central bank’s security.
It gets better: according to the man’s attorney, 654321 would have worked as well. It looks like the French central bank password is using a checksum based on additions or other very simple methods… (lol, scary). Maybe it’s time to “beef-up” security…