yubikey 4 openkeychain rsa [WAS: smartcard reader]

[Thomas Glanzmann]

Hello,

> The Yubikey Neo has NFC which is how it is usable with android. There is a
> video of it in action here:
> https://grepular.com/An_NFC_PGP_SmartCard_For_Android

I know about the Yubikey Neo. However it can only do 2048 Bit RSA. So
I'm really interested how to use the Yubikey 4 or Yubikey 4 Nano without
NFC with Android. Googeling a little bit around it seems there is patch
which works for some people but I was unable to find a howto use it.

Cheers,
        Thomas