-----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-concrete-cms-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-concrete-cms-18.0-bookworm-amd64.iso
      7ec47fbafed9ec12863d544e95aa83ebfd0453e49a35d5e965e39c9d5f220804  turnkey-concrete-cms-18.0-bookworm-amd64.iso

    $ sha512sum turnkey-concrete-cms-18.0-bookworm-amd64.iso
      adf621fe21af8255c4f859a4eef1e9d6058c34144769910f23fe656177ed83e78e33bdc57b099821378957be329a044c59960fc1b625c13e11a6551bcbe4aca9  turnkey-concrete-cms-18.0-bookworm-amd64.iso

   Note, you can compare hashes automatically::

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

    $ sha512sum -c turnkey-concrete-cms-18.0-bookworm-amd64.iso.hash
      turnkey-concrete-cms-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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3jcMig/9Fu7lkrQXQA8tPUEVGYIqm9P80URL1QcjnkuAmFwOFdPUULSm2cp8LBry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=AEe5
-----END PGP SIGNATURE-----