> It doesn't prevent a trojan from signing something other than what you > intended (if it's your master key on card, even another key or a new > sub-key) but whether this is a problem depends on your threat model.
I should mention that the current OpenPGP card spec doesn't let the card know whether it's signing a key or signing data. So there's no way to prevent this attack other than not keeping your master-key on card. I prefer keeping the master-key encrypted thrice and printed out in a vault, surrounded 25x8 by guards authorized to use lethal force. But seriously, I keep the master-key encrypted/printed and store it in my safe deposit box. The sub-key goes on the card. Trojan issue is a much smaller issue then, as the card includes a signature counter. I also keep a backup of the encryption key in case the card breaks. That's probably a good idea. -- PGP: A0E4 B2D4 94E6 20EE 85BA E45B 63E4 2BD8 C58C 753A PGP: 2C23 EBFF DF1A 840D 2351 F5F5 F25B A03F 2152 36DA _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users