-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

To ensure the image has not been corrupted in transmit or tampered with,
perform the following two steps to cryptographically verify image integrity:

1. Verify the authenticity of this file by checking that it is signed with our
   GPG release key:

    $ curl https://raw.githubusercontent.com/turnkeylinux/common/18.x/keys/tkl-bookworm-images.asc | gpg --import
    $ gpg --list-keys --with-fingerprint release-bookworm-images@turnkeylinux.org
      pub   rsa4096 2023-05-22 [SC] [expires: 2043-05-17]
            2614 7592 087C 0EDE 4214  3B63 7761 DEBA BBCF BA7C
      uid           [ unknown] TurnKey GNU/Linux Bookworm Images (GPG signing key for TurnKey Linux Bookworm Images) <release-bookworm-images@turnkeylinux.org>
      sub   rsa4096 2023-05-22 [S] [expires: 2043-05-17]
      
    $ gpg --verify turnkey-observium-18.0-bookworm-amd64.iso.hash
      gpg: Signature made using RSA key ID 26147592087C0EDE42143B637761DEBABBCFBA7C
      gpg: Good signature from "0"

2. Recalculate the image hash and make sure it matches your choice of hash below.

    $ sha256sum turnkey-observium-18.0-bookworm-amd64.iso
      aaf952fb1630f041a0695269e374d1b080fca5f2644a70752c47bc079e386433  turnkey-observium-18.0-bookworm-amd64.iso

    $ sha512sum turnkey-observium-18.0-bookworm-amd64.iso
      4fb6af7032c9f17fd65d43d0984d824293f54844b8aaaa96eb48b884a42eb66c4d0d4a50af2adc9000a3f9f0ba871d861961b22e0016ac9dd6e42592941748f7  turnkey-observium-18.0-bookworm-amd64.iso

   Note, you can compare hashes automatically::

    $ sha256sum -c turnkey-observium-18.0-bookworm-amd64.iso.hash
      turnkey-observium-18.0-bookworm-amd64.iso: OK

    $ sha512sum -c turnkey-observium-18.0-bookworm-amd64.iso.hash
      turnkey-observium-18.0-bookworm-amd64.iso: OK

    Final note, when checking SHAs automatically, please ignore warning noting that some lines are improperly formatted.

-----BEGIN PGP SIGNATURE-----

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pL7x9VGR0nB826NBHNDiZBgAzMiBo3bnUsA7ezFqBXTvRrlt4/D1H4ch/XlS88r5
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fWANgYnaxDs4YYfpLeA2SOn4jcDlkbkqKpi20f1zfNistf/A4L4Ho1ysUiXug0BH
Z5cUEz9G2lnAcHaydSPZ3X1UqnvMD4xNNxpRmGF7cmGsNmhwcACavLl93v10AznD
8rZvIEgsmI9a9KbMq3hJ0G88KGzHi1mneMKX4S4pfLEU5do/SsF6HZnEIC+heFue
/f8lBymZL19g0k38SEplisZoWWpXRzfOgZ6QHryJJutY+nHcciGMaJNaApYDhNue
/g5W8JwGMfwAesOcXBNyLIzXmrYtiuodOnLIXr7OYCh+FUzzUGka0PgUP7qak05j
b/5kGh5nTKzJ18fG3tLpX2dVqV2iZLCMD7dc6fzbukPjwcQQ5NOm1zOHMw/lGRlN
2PTeT00kB70ofN9tnBsnrgpKvsgUaGPh3wUSHXlI+A3l0fvyioMUkYB/XanMyZAJ
F3heKEJLz1gxcYaKFiQ3fSaKccpxOB3lTvI6Le8QDiAZhuHTOyM=
=kR4i
-----END PGP SIGNATURE-----