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.iso.sig gpg: Signature made Wed May 1 12:23:17 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 1bac5226c5116bc1a29966072f6c27ebb5600c9a * md5sum c703f865427e8c1c93c2654efdadcdad 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) iQEcBAABAgAGBQJRgQktAAoJEIXCXpWhbrlNWdQIAIkYm/Rk9ohN5CAOIp4zhAQR yhrlOlKCJD6qQEtn4/yjQLL/wRHLH2/+5j95z8hw8iV128gBrlfYYvRCdX7SZb/e R8vwLvhS5J4gL2+7gkyqTGmGMEgaycjEitsl/NrciiKdM7kIIY95r1QDdIMxdSOk WAxGd3XeTZlWXXfNrrSIk1mkYA8XQtcY1pJmEqeo9+qmNWdWP/wh3sSm9duXhg77 3lfGqCxNko3IIg7RUawXJbWJAjRQ5lzJOsuCrk43mZaVBwveQbKqrGNNXtBhMvjB td4J4ydyAUE8mh/deVnpAxFNTxuiwyAfVn3JbLIIJXFvcEWAsJjVcnf1gdrb0LY= =AAtQ -----END PGP SIGNATURE-----