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Re:FBI agrees to unlock iPhone for Arkansas prosecutor by OvidNaso on Thursday March 31, 2016 @09:23AM (#11396939)
Wasn't that the entire purpose and function (practically) of TrueCrypt's hidden volumes?
Re:FBI agrees to unlock iPhone for Arkansas prosecutor by pricechild on Thursday March 31, 2016 @10:39AM (#11397491)
https://en.wikipedia.org/wiki/Rubberhose_%28file_system%29 is another interesting implementation of the idea.

"Deniable Encryption" is the term.