This signature file may be used to cryptographically verify file integrity, like this:: $ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xA16EB94D $ gpg --list-keys 0xA16EB94D pub 2048R/A16EB94D 2008-08-15 [expires: 2023-08-12] uid Turnkey Linux Release Key $ gpg --verify turnkey-drupal7-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 17:01:41 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 530987b8cc2118ce14b977982a27e713933c08da * md5sum 1848f22534b07a59c12ff6b4017df5db You can calculate these on your end and compare to check for errors, but cryptographic verification is recommended for security reasons. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJQL8prAAoJEIXCXpWhbrlNzBYH/1Afjqzulxsqc9acDaIEE/0l DAkyGUS5SymtO6D6kNCML5rfaEIOY/s54k7eSNAJhKzZ7f3qsBmiVNbbuQMjaJV1 Xi3tuGEXQvtgz/jr7rt97dgKor7lQaUzx5gBZIvTdZwIZy7c1krdO1Php+N7yXiO MhaCwLYoi4laK/J6kS4q8NgBlKkDQvUy68veJqqBXumadFArB88m4xygcMxD6qqK QEAw1WKNGGXaa8WR9WmYD4MctxZLAH7O+8V4JeNIi7lnn5kyGiEdiXP0XpwcxGVN ih5vTBVnmxya0A90DRdKUuK3cd8Q3ffmeWiaTsXBVq2tLigTSPGR09krOmGZIUg= =kbUe -----END PGP SIGNATURE-----