paperkey

An OpenPGP key archiver. More information: https://www.jabberwocky.com/software/paperkey/.

• Take a specific secret key and generate a text file with the secret data:

paperkey --secret-key path/to/secret_key.gpg --output path/to/secret_data.txt

• Take the secret key data in secret_data.txt and combine it with the public key to reconstruct the secret key:

paperkey --pubring path/to/public_key.gpg --secrets path/to/secret_data.txt --output secret_key.gpg

• Export a specific secret key and generate a text file with the secret data:

gpg --export-secret-key key | paperkey --output path/to/secret_data.txt