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-nginx-php-fastcgi-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:35:04 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2ae8c430ba67448485fca0f33a9fe9a3f4d073b2 * md5sum 8c379c93f1be174a0d0b64a0992333cd 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) iQEcBAABAgAGBQJSMs4xAAoJEIXCXpWhbrlN9rsIALe4fw9Pij0d4ljySvtqS8jS RpNr9p3w9ecmzsIUK19ahaU8zSQ9z9iA0RlXOZ78H68bqQnJNLr6EKGD3mGQ8SpE 6WjPbIzKgyG/C65u7T930ZOI359ZfYRouKSxWnJL7Md6/633BCzb3rmK8mrghrGg qFpCipuK2rwp/ECMh3e0Y//05MAsRbzOQKBFEGMyETQniGVN/aIXSvbpEyWzXn3u 8ph8ce6ydwDYZ68gI9FnZl49un4CecYrloP+/L0Ex6yDiW7v6eFoJpL2QCkC6uyr 7FXbJFH5RoHZMl0/PzCFLUpYiED4qzgmJJHlwzEY8HgPVBhjJdy0esvq3wJV0Gs= =ZZLr -----END PGP SIGNATURE-----