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-lamp-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 12:49:31 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 889e8dc2232db3656d6e46ec4eb513abb1f5d215 * md5sum 0eb00843711b3516b206d08ab02bea53 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) iQEcBAABAgAGBQJRgQ9RAAoJEIXCXpWhbrlNvRMH/jTYxCg8sR31szWKJUkAOHLV qclytA3fhZ2CP8neic7z8Q4mvNHBJ7xNLJ6Ifeq93LgUc0522fdsYhRU1WEOWAHt 5Vs2HRQfHoOyvlz6S8EtBE6vwJQTHv6cxEUvjVik/5eUdCIdV5MRUt05477Pcbw5 WkX3EEL7AxA/xsAKT3GLN0Z3dFj9OSEQR5A+6ydKPvreu4xeDqIBlURPpKJMra+j qayQYQ2vI9UbFOFBs533cSzl7YeLwQFW18yvCwmsA0BMXa23WRbVsxoA9q/SYXgc hW8pAdvjZfCsQZr+1pTfUTTfaSI4pHAKN7qgRCX3NidvuUZYCbtvvKn0s/xQz4g= =B1b+ -----END PGP SIGNATURE-----