oramfs - ORAM filesystem written in Rust

Travis Biehn tbiehn at gmail.com
Mon Jul 5 13:56:31 PDT 2021

On Mon, Jul 5, 2021 at 4:40 PM Karl Semich <0xloem at gmail.com> wrote:
>> Hidden volumes solve for any type of coerced decryption.
> That's what a rubber hose attack is.
>> I can use Tahoe-LAFS for personal backup and it'll be encrypted, but
>> it wont have ORAM. Most academic work on ORAM is in the context of a
>> centralized cloud service provider. ORAM was not invented in absence
>> of a threat, but it may be applied to a system with no benefit.
>> Here's an example statement from https://arxiv.org/pdf/1605.09779.pdf
>> "ObliviSync: Practical Oblivious File Backup and Synchronization"
>> "ORAM is a powerful tool that solves a critical problem in cloud
>> security. Consider a hospital which uses cloud storage to backup their
>> patient records. Even if the records are properly encrypted, an
>> untrusted server that observes which patient files are modified will
>> learn sensitive medical information about those patients. They will
>> certainly learn that the patient has visited the hospital recently,
>> but also may learn things like whether the patient had imaging tests
>> done based on how large the file is that is updated. Moreover, they
>> might learn for instance that a patient has cancer after seeing an
>> oncologist update their records. This type of inference, and more, can
>> be done despite the fact that the records themselves are encrypted
>> because the access pattern to the storage is not hidden".
>> Karl, pleasure writing to you, I hope you understand a bit better why
>> I'm asking about ORAM-FS's benefits.
> I hear you asking with an eye towards when a large business or government might find it efficient to use.
> I don't understand why you are asking this.  I observed you didn't share a threat model.
> Oramfs is actually completely pluggable under the hood.  What do you think about expanding it so it can do non-obfuscated encryption if desired?
> This would be incredibly easy to add.

How do we know that your commentary isn't in bad faith? Textbook
disruption techniques. Please share your rationale for questioning my

Just kidding,

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