OpenPGP smartcard and RSA 8192 bit

[Robert J. Hansen]

> I just followed these instructions and generated a 8192 RSA key with gnupg.
>
> http://goo.gl/ycJZkj
>
> It works perfectly...

The limits on key size were chosen with great deliberation and for  
good reasons.  Although you are certainly free to change these limits,  
it would be unwise to do so lightly.  Most users who create extremely  
large certificates will immediately encounter three major problems:

* It won't work with smartcards
* Other GnuPG users can't verify signatures it makes
* Other GnuPG users can't encrypt to it

If you need a longer key, then wait for elliptical-curve cryptography  
to be added to GnuPG.  (It should be coming along fairly soon.)