I've been thinking about this (and the more general keychain problem) recently. Wouldn't it make sense to have your keychain stored on your smartphone, and allo

I've been thinking about this (and the more general keychain problem) recently. Wouldn't it make sense to have your keychain stored on your smartphone, and allow applications access over a standard protocol using NFC/USB/Bluetooth? Better still, let the phone do the public key cryptography (as in plan9's factotum), so that your private keys never leave your phone.