Re:Introducing WhatsApp's Desktop App
by rakoo on Wednesday May 11, 2016 @04:52AM
(#11673617)
> PFS requires synchronicity
No it doesn't. Multiple devices is a special case of multiple recipients, which the Signal protocol handles (and I presume Whatsapp does as well). See more details here (https://whispersystems.org/blog/private-groups/)
Now, that doesn't mean it already works in Signal/Whatsapp, because they have other constraints. But it's not PFS that prevents it.
No it doesn't. Multiple devices is a special case of multiple recipients, which the Signal protocol handles (and I presume Whatsapp does as well). See more details here (https://whispersystems.org/blog/private-groups/)
Now, that doesn't mean it already works in Signal/Whatsapp, because they have other constraints. But it's not PFS that prevents it.