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-joomla25-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 08:04:20 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 1af498b013a16e7baf7d8f67cd472e8f991b5564 * md5sum ec0c549c98efa50df045d0e3ef4d67ad 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) iQEcBAABAgAGBQJSAf97AAoJEIXCXpWhbrlNSJsIANXwuQLRVQE1spUNMlL2TjgG /xR/cQ9hhy+/8cEO9RZbu9qP21ihm3cFHF7A2j/74aUoZd40gQ3mzaqQb/xB8NlE 7Q9QEEyn1Vm+Uecje/3xwLKj7hpNRIrpbJ7BOg5Al37DNlYyDg+sivuneDpNBWkH Hfqsdpo79tdDEU5eRmjiUu5fGAelAU/uTWGeueWmAuxvEDaumQmEiwk7uv9rHlGR x5pYMJRkTSW293MiJH3kJ+mZsZkUrmPOROr4DiuciC8Krr7LdG7uhqN89d4RXri9 SO6pITwNckCJdOQsBnZzWdvARAM7zcMN/OGOS17ujHRYenoGfFFkh8Xx7Zzrt+o= =9PJQ -----END PGP SIGNATURE-----