It's weird that they're adding E2EE on voice but not in private text DMs, which is probably everybody's biggest concern when it comes to security on Discord. Better than nothing I guess.

Encryption on Discord. Okay, if you say so.

Discord’s audio and video end-to-end encryption (“E2EE A/V” or “E2EE” for short)

That last bit is a little concerning. E2EE is widely understood to mean full end-to-end encryption of communications, not selective encryption of just the audio/video bits while passing the text around in the clear. If Discord starts writing "E2EE" for short when describing their partial solution, it is likely to mislead people into thinking their text chats are protected, or thinking that Discord is comparable to real E2EE systems. They aren't, and it isn't.

We want an E2EE A/V protocol that is publicly auditable

Their use of the word "auditable" here is also concerning. What does it mean for a protocol to be auditable? Sure, it's nice that they're publishing their design, but that doesn't allow independent audit of the implementation that actually runs on their servers and (importantly) people's devices. Without publicly auditable code that can be independently, built, run, and used instead of the binaries they provide, there's no practical way to know that it matches the design that was reviewed. And even if code is made available, without a way to verify that the code being run is the code that was inspected, any claim giving the impression that the system was audited is misleading at best.

During the rollout phase, a single non-supporting member being present forces the call to transport-only encryption. The call will automatically “upgrade” to E2EE if that member disconnects.

This sort of thing has historically been ripe for abuse. (See also: downgrade attack.) I hope they are very careful about how they implement it.

The protocol uses Messaging Layer Security (MLS) for group key exchange

Interesting. This makes me wonder if their motivation might be eventual compliance with the European Digital Markets Act. If that is the case, perhaps they also have a plan in the works for protecting text chats?

My early impression, based on what they wrote:

This won't fix Discord's major fundamental flaws. However, if their E2EE A/V design holds up to scrutiny, and if they were to fix their problematic language and provide truly auditable client code, the protection offered for audio & video could at least reduce Discord users' exposure to unwanted harvesting of voice & face samples. A step in the right direction, and a timely one, given that biometric data collection and AI impersonation are on the rise.

The audit details and whitepaper details are far beyond my capabilities to understand. Can anyone with knowledge of the field tell us about the findings? If you would be so kind, please and thank you.

Good on them for getting an audit and making the code publicly auditable, but I really would like to hear an opinion from some folks who are more involved in cryptography on whether this is Discord being genuine and doing the right thing, or is it Discord trying to use Public Relations and weasel words to make it seem like they're doing the right thing.

It's just hard to trust a private company's motives sometimes, but that doesn't mean they're not capable of doing the right thing. Thanks to anyone who can give some input on this.

I’ll admit that I'm skeptical but since I could not get my friends to start using signal after about a year of poking at them I do appreciate it 🤔

I'm confused by why they would do this, and at the same time, why not for private text messages.

I'm in favor of encrypting as much communication as possible, but I don't think many of Discord's users were complaining that their voice chart wasn't secure. I'd expect more of them to care about text chart, which is less effort to spy on.

When it goes down can I get an error message that says Dave's not here?

I wonder how this scales to large voice rooms.

I am WAY too unqualified to understand any of the technical stuff, so I'll be waiting to hear thoughts from experts on this one. It looks like if there are no major flaws in it this is a great thing for the platform overall.