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-concrete5-12.1-squeeze-amd64-openstack.tar.gz.sig gpg: Signature made Tue Jun 4 12:55:56 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 8fc3363455d39e0c83d0e897c9688ffeb049d47d * md5sum 713aa423247f8d520f893d28e456630b 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) iQEcBAABAgAGBQJRrePUAAoJEIXCXpWhbrlNI/4IAJhjv0342skOVcP6Ct01iO41 CzjVdBc6uk8dzObSOBLzQDj7jEGRjTREZPDjWNu/bHQTsb5Vuvkn44obTM4ciUZT 9A+KlUxa8fa4iwqzzeFCMA3sRlqyeucUXxwhyuuD8szgo9ejX8Vh2+fRdTnEWTD6 3ObVyzyxQffZR4mvxTdhBm02k8c3U1GwusG92i+6QlVG4Hry+XyEByM9YxiU92/C 5fU65qvQqzoXM82yRFDi2WNT3dTvFxce0MFOOo+RVnYfpn/x3lG/RU7aiM0yeR5i tYXDsbA1fWQXQcFfWr2jBAgYa+Wf7D4qCmp7ktgRG9oQkc0neXTsjd3jWx5JXjA= =kAdq -----END PGP SIGNATURE-----