WhatsApp uses the Signal encryption subsystem and they only allow one other machine.
What is FB doing that allows this on Whatsapp but not Signal.
What a WhatsApp users opening themselves up for here?
What is FB doing that allows this on Whatsapp but not Signal.
What a WhatsApp users opening themselves up for here?
Ever since Signal introduced the desktop client, its multidevice functionality has involved fully fledged signal-protocol sessions between each device.
It sounds like WhatsApp is now adding something like this to their client, though it sounds like some of the details of the scheme differ.
In principal the signal protocol works fine for a multidevice scenario.
Oh, no...
Which means the server can just substitute keys in.
Users can catch a malicious server injecting incorrect keys by looking at security notifications and comparing security codes. This is part of the Signal protocol.
This may be tedious but only needs to be done in the event of phone keys getting reset (a once in a year event?), as all companion device keys are automatically verified with signatures provided from an account owner's primary (phone) device
Source: https://www.whatsapp.com/security/WhatsApp_Security_Whitepap...
> Please don't comment on whether someone read an article. "Did you even read the article? It mentions that" can be shortened to "The article mentions that."