Shaking Someone Down for His Password
A drug dealer claims that the police leaned him over an 18th floor balcony and threatened to kill him if he didn’t give up his password. One of the policemen involved corroborates this story.
This is what’s known as “rubber-hose cryptanalysis,” well-described in this xkcd cartoon.
Plausibly Deniable • April 28, 2015 1:44 PM
And that’s why your implementation should have Plausible Deniability features, why is this still a problem and why does practically no-one know about them?