problem signing with a smart card

[NIIBE Yutaka]

On 01/21/2016 02:54 PM, Tzafrir Cohen wrote:
> $ gpg2 --home $PWD --list-secret-keys 
> /home/tzafrir/gpgtest/secring.gpg
> ---------------------------------
> sec   4096R/19765111 2013-08-08 [expires: 2023-08-06]
> uid                  Tzafrir Cohen <tzafrir at debian.org>
> uid                  Tzafrir Cohen <tzafrir at cohens.org.il>
> uid                  Tzafrir Cohen <tzafrir.cohen at xorcom.com>
> ssb>  3072R/0325A0CE 2014-09-29
> ssb>  3072R/AFFB7FAE 2014-09-29
> ssb>  3072R/07DAF838 2014-09-29
> ssb   2048R/BBB53C25 2016-01-21
> 
> gpg2 --card-status shows keys matching to those three keys.

In the above example, you have a primary key and four sub keys.  How
three keys are on your card?  Please don't omit the output of gpg2
--card-status.  That's mostly important to answer your question(s).

It seems that you would confuse the capability of OpenPGPcard.  It has
three key slots, but the usage is defined as: sign, decrypt, and
authentication.

     When you store your private key to signing slot, you can sign.
     When you store your private key to decryption slot, you can decrypt.
     When you store your private key to authenticationslot, you can
     authenticate (say, with SSH).

I mean, you can only store a single signing key on your card.
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