oramfs - ORAM filesystem written in Rust

Karl Semich 0xloem at gmail.com
Mon Jul 5 12:30:57 PDT 2021

On Mon, Jul 5, 2021, 3:17 PM Travis Biehn <tbiehn at gmail.com> wrote:

> On Mon, Jul 5, 2021 at 2:04 PM Karl Semich <0xloem at gmail.com> wrote:
> >
> > I'm afraid I can't give a good answer because of my "locks" situation,
> but obviously we are enswathed with multi-user disk situations, for real.
> Karl,
> If I asked 'what do you have to hide?' then I think your spidey sense
> should tingle :) That's not the case.
> ORAM is a technique that you can apply to a system, an encrypted
> filesystem ideally incorporates the requisite design and mix of
> primitives in order to achieve effective operational security, with
> that meets operational impact objectives.
> I'm wondering why I would take on the operational costs (to my
> mission, say, 'taking over the moon', and cost, for example, of
> decreased bandwidth and increased latency) of a filesystem that uses
> ORAM, rather than conventional encrypted filesystems.

> As another example, a 'hidden volume' is a feature that an encrypted
> filesystem can have, I can explain that a hidden volume exists to
> counter a rubber hose attack. If someone

asked why a hidden volume is
> useful there's no problem in asking or answering the question. The

attack isn't obvious to everyone and consequently the benefit of
> suffering the operational burden of solving the problem (e.g. using
> hidden volumes with plausible contents) can't be understood until
> explained.

So maybe with this framing in mind; what attacks does the use of
> ORAM-FS counter?

What's your threat model?  I bet I can think of a lot.


Would you consider a rubber hose attack to be the only thing a hidden
volume can help against?

> -Travis
> --
> Twitter | LinkedIn | GitHub | TravisBiehn.com
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