>tl;dr: There is a “backdoor” in Signal nobody cares about, only Google can use it.
Speak for yourself. This backdoor is the reason why I don't use Signal.
Speak for yourself. This backdoor is the reason why I don't use Signal.
Why even use a phone?
I'm reasonably confident that my phone's OS is uncompromised and I take the radio problem into consideration as part of my threat model and change my behaviors on my phone accordingly. I have also made some progress on using OsmocomBB as a radio baseband, and on building a custom phone that treats the radio as hostile and isolates it as much as possible.
Neo900 looks pretty good for baseband isolation.
The phone network and the protocols for connecting to it are pretty user hostile no matter how open and secure the phone and baseband are though.
Don't forget the SIM card runs its own insecure OS that people have hacked before and you just can't replace that.
A Motorola C139.
>Which custom device are you building?
A, uh, custom one.
>The phone network and the protocols for connecting to it are pretty user hostile no matter how open and secure the phone and baseband are though.
>Don't forget the SIM card runs its own insecure OS that people have hacked before and you just can't replace that.
Yeah, I'm keeping both of those things in mind. There won't be any assumption that your phone calls or SMS will be secure, but rather that your mainboard OS is secure _from_ the radio and that you don't have to worry about discussions had near your phone and such.