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 debian-7-turnkey-concrete5_13.0-1_amd64.ova.sig gpg: Signature made Wed Oct 16 08:21:59 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 8eafa17c9208775de6f9e1a83f7effd0760ed1b4 * md5sum 7569018d661b6bfca9a31dc069d946a4 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) iQEcBAABAgAGBQJSXkygAAoJEIXCXpWhbrlNHngIAN3h8bwBzGrWVerDbwcPB1VH JQRYPwcP4MWNAbdT4JtJeCRssDlMxRIKNvnVDjOX5if8RSRImCQDiqLlHLFKmgIC gvdL9SwKz8htfdsFUuWQfprA9uMcxoEigcSBSDyfdO3DqPSjoNN7UWXAGDOHwd+H DUMPiPRKeIjWvP5NaFEtoGl/LaOQFB9TXLBBaN6XhpO4xPsUvtY92P1oZYNi/28m 4TnSPnkVLUbAf+G0SnXaPqe7Y++pFMhATRNzLCDTRcLtgxFQPvSNl15WwpopEOxT SGVHpWB6onU9BaNCPHyaBlv29x6biBORgfS+lcZhHrqpHoJQe6YAah0clWFOVeY= =MkUT -----END PGP SIGNATURE-----