Hi,
I generated keys on a Nitrokey and have chosen the option to make an
off-card backup of the encryption key:
gpg: NOTE: backup of card key saved to
`/home/archi/.gnupg/sk_26D728A8F09033F1.gpg'
as described in:
https://gnupg.org/howtos/card-howto/en/smartcard-howto-single.html#id2506175
Now I tried to use this backup key. So I imported the public keys, and
when I try to import the secret key backup file, I get an error "no user
ID" and the key isn't imported to the secret ring:
gpg2 --import sk_26D728A8F09033F1.gpg
gpg: key 26D728A8F09033F1: no user ID
gpg: Total number processed: 1
gpg: secret keys read: 1
I only found a hint so far that the key can be uploaded to another card
with the bkuptocard command
(https://lists.gnupg.org/pipermail/gnupg-users/2017-June/058438.html),
but I had hoped that it is possible to use the backup key without a
card. Any hints here, is this possible?
Greetings,
Ralf
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