Is there a good word for something to indicate its importance as something that would be dangerous or harmful if it were compromised or leaked? I'm thinking of something like a social security number.
Calling it dangerous or risky seems inappropriate: it isn't inherently harmful. It isn't a bomb. And if protected properly, it poses no threat. Calling it confidential or secret doesn't have the right ring to it, for reasons I can't quite articulate. Calling it valuable or precious also misses the point, as it doesn't have any large value to its owner if it isn't leaked (or at least, that isn't the point).
Yet in a way, I'm looking for a word that in the right way captures all three of those words. A word that says that about something relatively innocuous that there is a risk associated with it being stolen, and that it is therefore important to guard it well.