> t claims that, since some taxes data was compromised, the trust in the national Federated Identity is eroded "as if Facebook Connect was hacked". [... ] Anyway, I think most people won't care.

The taxes services is one of the oldest online government service in France that has existed, with a very wide usage.

As people had already that authentication as an identity provider, it was natural to reuse that authentication (not the password, but 3rd party auth à la OAuth, but a french government standard) to authenticate to government services that went online later.

So if the taxes auth is compromised (so far I haven't seen enough details about the coverage of the leak), that's a real concern.