Key-based FTP authentication

  1. make a strong ssh key $ ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa
  2. turn to RFC 4716 $ ssh-keygen -e -f ~/.ssh/id_rsa.pub
  3. add to ~/.ssh/authorized_sftpkeys on destination host
  4. try out:
    1. $ curl -u "<username>:" --key ~/.ssh/id_rsa --pubkey ~/.ssh/id_rsa.pub -T <file to upload> sftp://<target host>/<target path>/
    2. $ lftp -u <username>,xx ... sftp://<target host>

P.S.: Hetzner FAQ zum Thema SFTP + Keys.

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