[Cryptography] Open source encrypted file system for cheap IoT device?

[Henry Baker]

At 11:35 PM 12/23/2017, grarpamp wrote:
>No device info was included by OP.  Assuming BSD or Linux kernel, they both offer tiny simple full extent kernel block device encryptors upon which their standard filesystems can be laid down.
>
>Insufficient info given by OP to fit others.

I was hoping for an open source encrypted file system on an device that is so small and so limited that it doesn't even run a form of Linux.  It doesn't even need multiple processes or multiple threads.