1) An account created on a raspberry pi that has never been connected to the internet ever. 2) A great private key on this account, that does not rely on any random number generator. 3) The ability to sign transactions on the pi (probably a QR code will be used to get them off the pi).
I found a great solution from Vitalik himself showing how to create the account and even sign a transaction: python_cold_wallet_instructions. The line
eth.sendRawTransaction("<output of last line of code here>") is what I would perform on a separate computer. All seems great except one thing:
k = os.urandom(32) implies using the random number generator. How can I avoid using the RNG? Isn't this a legit concern?