RE: PGP flaw found by Czech firm allows dig sig to be forged

David Honig said:

What the world needs now

is a membrane keyboard, used only for entering keys, which can be folded into a credit card and stored in your wallet. If not hung around your neck.

Or an iButton ring...

Or implant...

This may be of some use: http://www.agatetech.com/products_q.html.