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-silverstripe-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 18:29:46 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum b0c7e2c46095a93b056905ac3653e713a4a991de * md5sum e538ec94b3a4b7a3221b0e54ff9a3366 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) iQEcBAABAgAGBQJQL98QAAoJEIXCXpWhbrlNL+AH/RuTLBW/vD7/wVqiLWKDSvyX NdGMgm9viRn9BF6uhFAYXfHPClQKjOssppUkiZoUq3Ei4dgae6Ri+oPbHfX2cxXC vsaIocvFrFhLm2GhAqLFx6pQEposzqBarTZR2yjkEDhQ6FmXkqjGVXEcfZ2kWm4B WtVbbkNNGI9NsnUOThEP4LVNrQxvtafNuHWch2ORA9fR2ez/2qKtQlIBMvpEOZR8 gv4eXDDbj5SnWZBq+chSZbXPeH2PQ+aPJ1YE/lD4ZPqwOnJbfHzUKRfpS+sIKkCs J9iVZWH1tNQZQQokOVyeW0SjtKHH/+EYwu9gYc3qUaQkvgy/T9/aQ6njZhbJiqc= =ud2T -----END PGP SIGNATURE-----