-----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 $ gpg --verify turnkey-moodle-15.2-stretch-amd64.iso.hash gpg: Signature made using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key " 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 turnkey-moodle-15.2-stretch-amd64.iso 35dc611e4d67a040941a1c50bc7b7796609d16b3fc833916674ba8f416cd3cd7 turnkey-moodle-15.2-stretch-amd64.iso $ sha512sum turnkey-moodle-15.2-stretch-amd64.iso 2fed02b82952b90bb6f63e807ae65cb567bf76b568d07fa1c75d6b373f1aec21e6cb408ab3bff937792ce0106db5cabe1a9e5203bebf213345c61f4310b5218f turnkey-moodle-15.2-stretch-amd64.iso Note, you can compare hashes automatically:: $ sha256sum -c turnkey-moodle-15.2-stretch-amd64.iso.hash turnkey-moodle-15.2-stretch-amd64.iso: OK $ sha512sum -c turnkey-moodle-15.2-stretch-amd64.iso.hash turnkey-moodle-15.2-stretch-amd64.iso: OK -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEaUz/JnlaKbrge061hcJelaFuuU0FAl0THAIACgkQhcJelaFu uU3qHAgA4WNhiUhBYhGYszJ408Ou3LFIhYuVWSsWIcSBz8bNVmK1v7hCBvLja8VN bxpUrK2AGNdNeznE4w7hHncZu/upBfFrSoNO0uWzQuMLb9PKrCz2ym0CD4mb6HkO hn3BAoHQSqosM/vXaEo1V7H4ycJ6XkjByfvO0PTUJWNbUPG4Hg21j41eOPrfRySK 24JBBBwzppvg1DIShpVgKMm/trAnXH5GeLsTXArKg6JwZTGT8/ZBDsr8fYA2dhWj qXHHCV4U9fD+E01056ciqO0o1khgN3N9W3gQz2QrLOhEHXpQ0GFw7iOnAcVPVwzl Yw23MEifycQxYI78EuilwnvIriVMqg== =Y5cF -----END PGP SIGNATURE-----