I would like to add to it that we do not know how various seemingly insignificant signals can be correlated together to reach some more significant conclusions.

I would like to add to it that we do not know how various seemingly insignificant signals can be correlated together to reach some more significant conclusions. I always remind myself there exist people much smarter, much more motivated and with much more time on their hand who think about these things and figure stuff out. To deal with the problem (of security) seriously, the only possible sane policy is to not provide ANY unnecessary information under any circumstances. And that might not be enough, because the information that is legitimately needed to get the things we want might already be way too much.