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Good stuff! If I remember correctly there was company at Defcon selling memory cards that had this feature built into them a couple years ago?

I miss TrueCrypts alt boot option. You enter a specific password it boots an alt OS so you could have an automatic alternative thing if under duress.

VeraCrypt exists

Also there is patches for luksOpen that destroys the key if you give a "duress" key. Not that would work in proper forensic operations.