-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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://keybase.io/turnkeylinux/pgp_keys.asc | gpg --import
    $ gpg --list-keys --with-fingerprint release@turnkeylinux.com
      pub   2048R/A16EB94D 2008-08-15 [expires: 2023-08-12]
            Key fingerprint = 694C FF26 795A 29BA E07B  4EB5 85C2 5E95 A16E B94D
      uid   Turnkey Linux Release Key <release@turnkeylinux.com>

    $ gpg --verify debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz.hash
      gpg: Signature made using RSA key ID A16EB94D
      gpg: Good signature from "Turnkey Linux Release Key <release@turnkeylinux.com>"

    For extra credit you can validate the key's authenticity at:

      https://keybase.io/turnkeylinux

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

    $ sha256sum debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz
      f1e028f22a1c566fdfacfcbca3fcde82cc128ad167ad6c60cd04c3e8fefd4352  debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz

    $ sha512sum debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz
      ba5e972038d0f4f9c558a523a9fe85826c493240411fa11a99a5b710ecd1efb6631bdcaa44d3bb077fbaa25b38507917c2a64f9e733850e6d085df4c68dd49e3  debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz

   Note, you can compare hashes automatically::

    $ sha256sum -c debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz.hash
      debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz: OK

    $ sha512sum -c debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz.hash
      debian-9-turnkey-concrete5_15.0-1_amd64.tar.gz: OK

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uWuhDHDen6hW75HnCkCTWbs6FKch4+pnajCXZA0qgqZDn9zBg8so7M4SIxC18dCD
OmZvuJtBMukBQwwQ5EYGi4ie+K1uFa2BvJ9GwLRHQrQpsSXshppJP5jm7ukgMyZT
XWCq49arBCju1ZAxxMmFsqwmjtcxtKdUd1eb1p+D5Wiid76YYO/f5g4lsQ6Umj/i
nQIli+et0KT5eQMKs1AOfx+V9g1VKQ==
=FTWc
-----END PGP SIGNATURE-----