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-concrete5-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 13:40:30 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum a0f7ecea1342251cf30e1836ec1a15f85f39945f * md5sum 4fa703f21368adec3165a55efff91865 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) iQEcBAABAgAGBQJRb/e4AAoJEIXCXpWhbrlNC5IH/iDO9NtKS6nes/Gb4RBHBzqm /ghf6JVuMonmdG+tmw+RyuEtQ/U3/boN8g7SlCE1inEOsEH7xg+MHpPvtZ5G9kux oxitlP8W10ydeiIXy4f25zbKVyJF3b8olrmeuV7IohQkpMJkWlSRcZzNEImEGgG9 5l1n8iSJ3IhZtdrwYJrievfHlzvjBJlsnK3fk5OEBnGSk0boFGCjK5QhdjUbOtS+ CpE0ba4BtpzOzuJ1UUIHJBg++ABha8PRCWGCDGre3WAGsLIWkCYkoBsZLgWHZBcf qNlRDqIOaB7gh1ZE1eJ9Rlc+hM4hqCS+PIXwekHJHqyABAlmufZmCzN6T1TM7Ts= =321g -----END PGP SIGNATURE-----