If you're not worried that someone has hacked your device to get your plaintext, then this probably isn't useful.
This seems to be specifically designed for people who are worried that their communications device has been pwned over the internet. So, people who are under fairly targeted, active surveillance.
Hence requiring three physically separate computers and data diodes at each end, to try and physically prevent attacks over the network.
Comments
If you're not worried that someone has hacked your device to get your plaintext, then this probably isn't useful.
This seems to be specifically designed for people who are worried that their communications device has been pwned over the internet. So, people who are under fairly targeted, active surveillance.
Hence requiring three physically separate computers and data diodes at each end, to try and physically prevent attacks over the network.
It's not just individual targets. The big concern is economics of automating remote exploitation, as explained by ACLU's Christopher Soghoian here: https://media.ccc.de/v/33c3-8136-stopping_law_enforcement_ha...