Cannot export SSH public key

[Ingo Klöcker]

On Mittwoch, 27. Dezember 2023 13:40:40 CET Felix E. Klee wrote:
> Thanks for pointing out that the signature key and the authentication
> keys are identical:
> 
>     $ gpg --card-status
[...]
>     Authentication key: 7A0F E73D DB74 4F0F 9734  1DA7 1BE3 49D1 1B6E
>     D589
>           created ....: 2023-06-29 03:50:43

-> Apparently created on the same day as the other keys on the card.

[...]
>     ssb#  rsa4096/32B106F6877CC64B  created: 2023-11-22  expires: never

-> Apparently created about 5 months later. Also note that "ssb#" indicates 
that this is a stub key, i.e. the secret key doesn't exist on disk (or on 
card).

> At the same time, here the key IDs are different:
> 
>     $ gpg --list-keys --keyid-format LONG yubikey at f76.eu
>     pub   rsa4096/1BE349D11B6ED589 2023-06-29 [SC]
>           7A0FE73DDB744F0F97341DA71BE349D11B6ED589
>     uid                 [ultimate] Felix E. Klee (YubiKey) <yubikey at f76.eu>
>     sub   rsa4096/7CC02D68D2E31736 2023-06-29 [E]
>     sub   rsa4096/32B106F6877CC64B 2023-11-22 [A]
> 
> How does that go together?

It doesn't. The authentication key on the card is different from the key on 
disk (or rather "not on disk" because you lack the secret key of the 
authentication key registered in your keyring).

Regards,
Ingo
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