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-concrete5-13.0-wheezy-amd64-openstack.tar.gz.sig gpg: Signature made Wed Oct 16 08:29:56 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum f405ba8315656db6f2d26a2769ff19c15a21ef81 * md5sum 789181f19273e51a3d9d498ff08c0fdb 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 v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSXk57AAoJEIXCXpWhbrlNGLIIAMtdxIrQpYvi7eyp+y5KMNXy EMqWxZdcbGqI+Ko7X5pXhPX/x/aHdfslxErdhe/UtW9/4LUEA1go9VQqdpYPd3ok 1VQHD71tZibVUMLJ5AtpxCra3ftN+3CVaxynmAGxjnxX0IU33OCrgCETDOdHEvoI 12GCZEsGJozFe+z2ObOSBau3gJloO0zv6Jm4gI537xSkTN3Vpjzl3sO+avyR0GDz p8kbs4srLZqgZkZlRViwEMeHWpyCODZxB1gi5RvvXAx0PUnS1gJu4d9Kv7hIA2FL u5sq/AVtQo5QaNDls9G0LxwEhZX/jg10lr2KxidYb9O9jV4ATt4QFtKUWL2QWVw= =53iz -----END PGP SIGNATURE-----