Someone, maybe on reddit, was asking how this applies to bitcoin.  Well, the answer to protecting private keys recorded as QR codes, he comes up with is to use memory-hard encryption that takes 60 seconds to validate an attempt.  For me, that type of protection would be the holy grail that would let me keep backups of my paper wallet(s) as QR codes without having to worry about securing the QR code somehow (in a vault, etc).

Did anyone else get excited about that part of Steve Gibson's thoughts about how to implement his SQRL authentication idea?  That part is perfect for bitcoin users.  I am hoping it inspires ethiopei to implement that kind of encryption on armory paper wallets.