But can you detect the link being broken by someone other than your intended communication partner?

If A sends a particle to B, couldn’t M intercept A’s particle and send a different particle to B? Kind of like intercepting Diffie Hellman. A and B will both share some information with M, but not with each other.

So they’ve shown they can send light over a cable designed to transfer light.

The impressive thing is of course managing to get one specific photon to one specific location. Still, what benefits does that have over the standard encoding?

I guess this technique might have a lower error rate and higher distance, because it’s binary by nature with no quantization needed. But you don’t need the quantum entanglement part at all for this.

Edit: Reading is hard! This is indeed exciting for security. I wonder how it fairs against a very powerful MitM though.

They likely use adblocks themselves.

You’re right, it is misleading. There are different “flavours” of MTProto. See here:

https://core.telegram.org/mtproto

This page deals with the basic layer of MTProto encryption used for Cloud chats (server-client encryption). See also:

• Secret chats, end-to-end-encryption

• End-to-end encrypted Voice Calls

(The major difference is simply whether the server and client share a key or two clients)

MTProto is not end-to-end. MTProto is their obfuscated client-server transport encryption.

What the commenter above is referring to is Telegram defaulting to saving your messages on the server in plaintext. You can use a “secret chat” which enables end-to-end encryption, but that is separate from MTProto.

Your sentiment is correct though. Messages should not be visible in plaintext to the server.

Except Telegram doesn’t use TLS :) They use MTProto.

This is not me endorsing Telegram. I’m just pointing out your mistake. Telegram has other issues but it definitely does have transport encryption.

Oh they do love using open source for sure. It’s free after all! /s

I fail to see how that’s Google Maps’ fault. This is the city’s fault for not blocking the bridge. Would people have complained if a paper map didn’t update all the collapsed bridges daily?