[messaging] Question regarding Whatsapp/Signal Safety Numbers

Jeff Burdges burdges at gnunet.org
Fri Oct 6 09:39:59 PDT 2017

On Fri, 2017-10-06 at 15:42 +0200, Jeff Burdges wrote:
> If ACKs do not advance the ratchet, then one could offer a "current
> safety number" derived similarly to ratchet header encryption keys,
> right? 

Oops, ACKs that do not advance the ratchet do not make this work.  There
are more complex schemes that work under assumptions like synchronized
clocks, but probably not worth the effort. 


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