[Cryptography] Signal Security / Secure Chat Metadata Traffic Analysis Generally

[John Levine]

It appears that arxlight <arxlight at arx.li> said:
>Of course, all the government needed (I think?) to recover this chat 
>information was SBF's unlocked (or locked, if they had the capacity to 
>break in) phone, but it will be interesting to see exactly how the 
>material is developed and if more material comes to light.
>
>In the interim, I'm quite interested to learn what the list gleans from 
>this document.

Most likely they got the list from his phone. But a quick look shows
that most (all?) also include Caroline Ellison, Gary Wang, Nishad
Singh, or Ryan Salame, all of whom have pled guilty and are
cooperating with prosecutors. It wouldn't be very hard to combine the
info from their phones.

I believe that during the trial someone said they turned off auto-delete
because they realized it looked bad and might be an additional violation
if they were told to preserve evidence.  No big surprise there.

R's,
John