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-domain-controller-13.0-wheezy-amd64-openstack.tar.gz.sig gpg: Signature made Wed Oct 16 08:31:28 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum e35e6b003650132afd827bcea067e61f6b082128 * md5sum be0fe98605b8497f6839649c6d5a9aaa 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) iQEcBAABAgAGBQJSXk7XAAoJEIXCXpWhbrlNxxgH/Arbj5YyNIiOm5lYaM1KBM+L jCl0s++9mJBz3wrxDBjMQT1+j7BGxhAHZ+JpSsUWACcJ/aFzrmWBa0s4XfCD2tv6 65Bx977jwhP1CACsg4RD1Oe1AZMo+LCB5+QaQmC3rUuSYzk3Qe0TruXr+aA4HYlA w0/91KlFVH6rG+hqUX+YI5FxsgI2YFPdd0B/vx49EQ7aWkEWax5E6eYfeDwwN0M5 c5ywKcitb4BKVPIOVIihsvkupkzfD+zpHKl6gfM/6joV5vQ4O9n8p12oS1PRDIJZ 4g7d0MeBKiP+xKt2m0RLviTwi2Y/aVgFrKqQ4aIDYtcUGpCuZh1Jfr1nDem5rgo= =kfqT -----END PGP SIGNATURE-----