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-roundup-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:06:47 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 7fda7cde4cf7a4b9efcd862bfe1740a44c96fe82 * md5sum 444dad13c151a7f2e89abd1a48659eeb 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) iQEcBAABAgAGBQJSMtWhAAoJEIXCXpWhbrlNvwQIAOBekf9vNSvt/m3VDYhfx+xO /VO3Ae/NUuf0V4VNK22H69KHP9VCUG5fEzV4kO+wQCokwerufq6w8f2yKe3X0NED FNGEusiJwk7RzxRICzDrfnzxxTwA6/nm4uiEZWXvTtTdtKrjv72nsF6qhNKlc6A6 8YcpXvsi/sSPQ06q0tt0W0pql+7084gcC6vX3Wcrv0wuHVlIAqcaK5S2aJ8t1hvE 9OpWZDU1veOTLptwL3KEYeDsV4TyefkP7q8JXF4n2rJKCPugrfwOPbzjbsZbki7U OFyTpa+5IuH6qDRow9SF0derrTG+XUnGLpLdUlOVt3iZrxACoWO+mvFx3gaMdRk= =B78c -----END PGP SIGNATURE-----