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-ovf.zip.sig gpg: Signature made Tue Jun 4 12:48:05 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum ef6200b0d44f7444a5ad8415f3aa23faf15826c8 * md5sum 85de706d96809de256526812b281ac3d 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) iQEcBAABAgAGBQJRreH8AAoJEIXCXpWhbrlN6BoH/3sblcT5VAtgmPmYFYODhPSj Bgyx6pYvPad8FAglVDeWhXzlwHDucqBfKCKulQrUv+MxlqOsUBzEZrQH0IySrTWQ vKKk0lkGgG8UoT52jWbepfw3L/3JznnhZgqZP6t0jVfjsURayxOZB/puVWyVj4ah Xmiz677ci9rQs0dvrDlrT/B6aYPUT2NIIV4CNeeKzxM+4Jc1ovxmYWS9JiTk7Et7 5xf2dvHhZP3bmozb7ybfKDsePLD54C1QiHUbCx7ETqVv6BEGektkGhgZKQCZyiR7 kBkS1HlS5ukHE+CWYsRtyF4XBTXec38ChsZnPDA8jdby69FHY7m7G0Bhmfs63uM= =SLP/ -----END PGP SIGNATURE-----