I always feel uneasy to connect a device with private key directly to an untrusted online computer
I hope something like a audio modem could be implemented but seems it's too slow to be practically used?
https://bitcointalk.org/index.php?topic=135423.0It is already implemented in Electrum, just not easy to setup and use...
Be it slow or fast it seems a nice and secure idea, I think...
Any wallet software that has offline signing functionality will work using software like
minimodem. An example using Armory:
https://bitcointalk.org/index.php?topic=735111.0How fast it works depends on your tx size. I agree slow don't matter much in this case, as security should be our main concern.