In grade school, I had a policy of telling people “no comment” or “that’s classified” on any subject that could be sensitive. This is slightly better from the point of view of actually keeping secrets, since suddenly clamming up if people ask you if you’ve ever made a bomb is giving a bit too much information.
You can presumably say ‘I can’t tell you that’, which suffices in many but not all circumstances.
In grade school, I had a policy of telling people “no comment” or “that’s classified” on any subject that could be sensitive. This is slightly better from the point of view of actually keeping secrets, since suddenly clamming up if people ask you if you’ve ever made a bomb is giving a bit too much information.