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Two possible (partial?) solutions mentioned on this thread were:

- TrueCrypt's hidden volumes

- Two OS's on the same phone; you have the innocent one booted up, and the other encrypted.

What are your thoughts on these?

Not novel, but not widely known about is the (original?) Rubberhose File System[1], where you can have a number of deniable partitions, and adversaries shouldn't ever be entirely certain you've given up all of them.

[1] site seems to be dead, but still on archive.org: https://web.archive.org/web/20110709155818/http://iq.org/~pr...

Also, proff is Julian Assange.

Is it possible to create a "zip file" format that looks like a normal zip file, but has two passwords and two separate paths to decode to different content?