QR code login through GDM?

[Konstantin Svist]

On 04/02/2011 04:36 PM, Patrick Kobly wrote:
> Now...  I could imagine a use for this tech for auth.  With a mobile device, you could create a soft token - where the qr code changes frequently - like with a securid. Maybe even as part of a challenge response scheme - where the challenge is displayed to the mobile device as a qr code and the device displays the response as a qr code. I am unaware of anything existing that does this. But I certainly wouldn't see a static printed qr code as useful for AuthN in just about any scenario.

I was thinking of the same thing until I saw OP mention it will be on ID 
cards.
If it were on a cell phone, one could type in a PIN to make it somewhat 
more secure (otherwise copying the QR-generator program would be too easy)