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End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

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31–40 of 105 posts

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#31
post #11

The world changes once you realize why usually encryption is capped at AES256...

256 bit symmetric cryptography keys are a bit like picking one atom in the universe (10^80 atoms, or 100000000000000000000000000000000000000000000000000000000000000000000000000000000). Your opponent would have to test half of the atoms in the universe to have a reasonable chance of getting the right key. That's generally understood to be not feasible.

He could get lucky though. :-P

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#32
post #15

Earlier quoted context omitted.

I have not seen this take before, do you have any pointers to someone making this claim?

Founders with US affiliation/physicist creating crypto products [1], faulty claims how the relevant Swiss law (BÜPF) applies to them [2], doing crypto in JavaScript on the client side, etc. To me, this smells like Crypto AG [3][4]. [1] https://proton.me/about/team [2] https://steigerlegal.ch/2019/07/27/protonmail-transparenzber... [3] https://en.wikipedia.org/wiki/Crypto_AG [4] https://en.wikipedia.org/wiki/Operation…

How else would you do client side crypto for a website if not with JavaScript, isn't that kind of the point of how Proton does E2EE?

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#33

Earlier quoted context omitted.

Founders with US affiliation/physicist creating crypto products [1], faulty claims how the relevant Swiss law (BÜPF) applies to them [2], doing crypto in JavaScript on the client side, etc. To me, this smells like Crypto AG [3][4]. [1] https://proton.me/about/team [2] https://steigerlegal.ch/2019/07/27/protonmail-transparenzber... [3] https://en.wikipedia.org/wiki/Crypto_AG [4] https://en.wikipedia.org/wiki/Operation…

Is the suggestion that founders who have US affiliation are automatically in bed with three letter agencies?

If they're physically located in the US, they have no way to stop (legal) coercion by the TLAs yeah?

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#35
post #34

If you don’t trust your cloud provider to not look at your data, why would you trust them with encryption? It’s not hard to encrypt it before you upload it.

Because not having to trust the provider is the entire premise of these services, and without that premise, you might as well just store things in GDrive.

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#36

I wonder how Cryptomator [0], EncFS [1] or gocryptfs [2] stacks up. [0] https://cryptomator.org/ [1] https://vgough.github.io/encfs/ [2] https://github.com/rfjakob/gocryptfs

If they aren't multitenant systems it doesn't make sense to compare them to the targets of this paper.

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#37

https://dropbox.tech/security/end-to-end-encryption-for-drop... dropbox has been mentioned in the article and I think the author is drinking kool-aid and throwing random facts

It's not an article, it's an academic paper, and Dropbox isn't one of the targets.

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#38

Nice to see that Tresorit didn't have any serious issues in this analysis, I've been using that for a long time and it works really great, also one of the few players that have a really good Linux client. The two vulnerabilities they found seem pretty far-fetched to me, basically the first is that a compromised CA server will be able to create fake public keys, which I honestly don't know how one could defend against…

Tresorit had a game-over vulnerability: public keys aren't meaningfully authenticated (the server can forge keys; the CA the paper discusses is operated by the service) and any attempt to share a directory allows the server to share that directory with itself.

Re: End-to-End Encrypted Cloud Storage in the Wild: A Broken Ecosystem

#39
post #36

I wonder how Cryptomator [0], EncFS [1] or gocryptfs [2] stacks up. [0] https://cryptomator.org/ [1] https://vgough.github.io/encfs/ [2] https://github.com/rfjakob/gocryptfs

If they aren't multitenant systems it doesn't make sense to compare them to the targets of this paper.

I suppose I meant for the specific use case where you store and sync the encrypted file systems with cloud providers like e.g. Dropbox or pCloud.

But perhaps I've misunderstood you.

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