I wouldn't be surprised if Google has tried this. Remember their short-lived QR code-based logon system? http://www.theverge.com/2012/1/17/2714263/google-expe

I wouldn't be surprised if Google has tried this. Remember their short-lived QR code-based logon system? http://www.theverge.com/2012/1/17/2714263/google-experiment-qr-code-secure-login-sesame http://www.theverge.com/2012/1/17/2714263/google-experiment-... http://www.zdnet.com/blog/igeneration/googles-qr-code-log-in-experiment-concluded/14679 http://www.zdnet.com/blog/igeneration/googles-qr-code-log-in...