I don't have a definite answer. There's the path we're executing on at Open Whisper Systems, but there are a bunch of other projects working in this area as well (Mailpile, LEAP, etc).
I think the problems are solvable, but only if we have a different design approach. So when I see projects trying not-PGP, I'm interested. When I see projects building on PGP, I'm less interested.
I'll take the opportunity to say that it saddens me that I still can not communicate using TextSecure with iOS users. It's been almost two years[1] since iOS support was "promised". TS is great, but we need to be able to communicate with iOS users.
Also, any vague timeline available for arrival of the desktop Signal version? What about video-chat support? Would that be possible with WebRTC? (although you should probably wait until ORTC is supported within WebRTC - v1.1 I think?) and then add ZRTP on top of it. Or is a desktop, Javascript version, just not secure enough for that to happen? What if you do it like Whatsapp's "web app", that basically only connects locally to the phone?
I think the problems are solvable, but only if we have a different design approach. So when I see projects trying not-PGP, I'm interested. When I see projects building on PGP, I'm less interested.
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