Example of a system doing A+B+C -> Skype. You can claim that they have some way to clone the traffic for NSA use - maybe they do, but from the technical point of view - they satisfy the requirements. It also relies on Skype doing proper authentication / identity presentation.
Hardware-only plug & play box will never work here. You actually have to know something about the connection - information provided out of band. And I don't think most people would accept pressing ~150 digits on the pad as an easy solution.
Analog encryption does not end on scramblers and they don't have to be a joke. As mentioned before, put 2 modems together, apply gsm encoding and any digital encryption you want.
There's a lot of FUD here. If you come up with a proper system, black vans will take you away; NSA has gentelman's agreement; your product will disappear from the market; etc. etc. I don't think you can prove any of it and I can't disprove it either, so I'd rather stay with things we can be sure about.
If it doesn't have backdoors now, it will soon. The remote-intercept capability mandate for land line phones is in the process of being extended to all commercial VOIP.
> Hardware-only plug & play box will never work here.
> But the absence of any easy-to-use/uncrackable/provably non-backdoored secure voice phone on the market is proof enough for me.
If you have to worry about being monitored by government, a super secret phone will not help you anyways. If it's worth doing, your room / furniture / clothes / windows are already bugged and all you say will be recorded before it hits the phone. I really think a provably secure phone is a non-issue.
If it's worth doing, you will be caught and tortured. "Extraordinary Rendition."
The worth of the phone is to prevent you from turning into someone who ought to worry in the first place.
Bugging room / furniture / clothes / windows is expensive.
The NSA is known to use voice recognition and keyword search. It is no longer necessary to already be a target in order to be extensively and intelligently eavesdropped on.
Hardware-only plug & play box will never work here. You actually have to know something about the connection - information provided out of band. And I don't think most people would accept pressing ~150 digits on the pad as an easy solution.
Analog encryption does not end on scramblers and they don't have to be a joke. As mentioned before, put 2 modems together, apply gsm encoding and any digital encryption you want.
There's a lot of FUD here. If you come up with a proper system, black vans will take you away; NSA has gentelman's agreement; your product will disappear from the market; etc. etc. I don't think you can prove any of it and I can't disprove it either, so I'd rather stay with things we can be sure about.