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-tracks-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 19:14:07 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 1af827c96efc6144abf5a4ed05320735555d5ab8 * md5sum 50411d11a8fdad6f5fc713f0fe17f2b6 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) iQEcBAABAgAGBQJRcEXwAAoJEIXCXpWhbrlN0/0H/2LY0dktLn28hsGME5QKsjrb 0AdUhB1zmDCHa9F8mX/Owsya+YP4yUXJoITPrwJQo5+4RcckUeB565rLO0+bE+Kz ew3M8l7foBabF3vg8cb/DfTvPR4VofkgSoNm9ny92pJr7outIlNIVt09tbp1dEh7 LYuOd2eWR8bEJwod0iys1xuKgyvCQnsWUa48A7PWV/eiqMtn//Te6H3NGxBMdjqY /o+RPtFPRl/BDhH2NkHqtLua/z/Ot2ZvEC1+aAGTFcvKSo3X5BOlgh5SoHR6oe5a 2ZrK6ZKyOz/4s/znD5+XHdyYjDtWmAijlVcSnhjYELZZpS80M7R01mvdciPI2Iw= =4E0j -----END PGP SIGNATURE-----