sexy_peach

@sexy_peach@feddit.de

peertube: diode.zone/a/sexy_peach/video-channels

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voxel, to Signal

So, I'm interested how the implementation of "Perfect Forward Secrecy" in Signal looks like, like does every messages has a different encryption key? or does it change over time like does? I tried to find any official documention of this, sadly did not find anything.

Thats why I'm asking, does anyone of you know smth about this and maybe can provide a link to a official source?

@signalapp @SignalUpdateInfo @privacy

sexy_peach,

en.wikipedia.org/wiki/Double_Ratchet_Algorithm

This is the encryption that they developed. Whatsapp and OMEMO (XMPP) use it as well. It has forward secrecy because if an attacker has the key for a message they can’t calculate the key for the key for the next message etc.

sexy_peach,

essentially, yes. There are two levels of encryption keys and they “ratchet” along (change). Only the lower level is used to encrypt the text so it’s much harder to figure out the other one.

sexy_peach,

Double Ratchet Messaging Encryption - Computerphile

youtu.be/9sO2qdTci-s?si=qPbDZ2-x_VSiEZ-1

sexy_peach,

Since Ig we all know this message which appears when the “keys” ig, changed

I don’t know if I fully understand you here.

To my understanding whatsapp does it like this too. The key changing must be the high level key, since the message means that it’s an unknown key (thus not yet trusted). From new install or new device.

sexy_peach,

Diffie-Hellman is only a key exchange protocol and does not provide forward secrecy. Imagine that my and your client figure out our shared secred (key) with DH, then encrypt our chat with that. If someone breaks only a bit of our traffic, then they can read newer messages as well.

en.wikipedia.org/wiki/Forward_secrecy

Forward secrecy means that at any point messages are encrypted with keys that aren’t reused forever, which means if an attacker can intercept traffic and read a bit, or crack the encryption, that they don’t automatically get access to our future conversation as well.

sexy_peach,

Wait how do I have to read this? Does Qatar have 3.39 men for every woman???

sexy_peach,

of course not

sexy_peach,

But Skyrim is beautiful even with its older graphics and has an interesting world to explore. Grey space metal structures on grey planets just aren’t interesting. Also even more so if the story starts with “you touched a weird rock”, don’t know why but here have my spaceship.

In Skyrim you’re waking up going to be executed next moment there’s a dragon attack.

sexy_peach,

fair

sexy_peach,

Haha of course, yes. And space engineers, oxygen not included etc

sexy_peach,

I love death stranding for example.

sexy_peach,

Just confiscate all their money and the money of the shareholders of the past and present. They knew what they were doing. Then shut their enterprise down.

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