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-tkldev-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Tue Jul 30 12:35:33 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum f45423075808bf97132f91987163831826820796 * md5sum 9a5eb022c4b86341c946e3af5aead8cc 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) iQEcBAABAgAGBQJR97MNAAoJEIXCXpWhbrlNX+MH/1yXC8IrrfD11oo5gcN7GYT+ aANgAFvTVjOChzcQAcmxNJ+fsVWxak6lnxqn2XnN28V29/cxCgucqJcpWghxG1nN UpMB9psoWc6AMtSNlhqHckhQ1fZyzyJJYtBHGENphe0NSkoBkB42htC8KatxdGWh /8MQZrdXnO4noPavK+Hbgtrxk9R0LQ9MR+QGUfKObPI5VZvcmYSh8Ro7lmGGdiyG yFGQU364V2de0f7C/caRvWdutaZ+FWgod0GTZF2Le7PGQl9qZXf7uN5GBFKcbin1 77C49FxjAQLsiVFEoVt5xbP0Y5MbNwFTkEGqbJ8GD4dsyIPSfip8hsrJ5RDqlVE= =64Q7 -----END PGP SIGNATURE-----