Didn’t Signal update their protocol to make it post-quantum?

Now we wait for someone to build an absolutely wonderful chat app on top of this wonderful bit of PoC code…

I genuinely hope someone does. Imagine what this could do if this was routed over Tor using Private Services.

Run this over that; and you’d have a bullet-proof text chat. Wrap a nice GUI client around all of that and you have a proper secure, anonymous messenger with no problems. With a little more build-out; you could even implement the Matrix protocol over this wire-line and basically have full inter-federation and moderation over a secure wire protocol; allowing for complete privacy and client integration.

TL;DR: Matrix over PQChat over Tor. Think about it. A Post-Quantum Dark-Matrix web.

Neat.

Warning disclaimer : I’m not a cryptographer.

I actually tinkered with https://github.com/open-quantum-safe and it’s actually quite simple to become “post-quantum” whatever. The main idea being that one “just” have to switch their cryptographic algorithm, what one uses to encrypt/decrypt a message, from whatever they are using to a quantum-resistant (validated by NIST or whomever you trust to evaluate them) and… voila! The only test I did was setting up Apache httpd and querying that server with Chromium and curl, all with oqs, while disabling cryptographic algorithms that were not post-quantum and I was able (I think ;) to be “safe” relative to this kind of attacks.

Obviously this is assuming a lot, e.g that there are not other flaw in the design of the application, but my point being that becoming quantum-resistant is conceptually at least quite simple.

Anyway, I find it great to demystify this kind of progress and to realize how our stack can indeed, if we do believe it’s worth it now, become resistant to more threats.

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