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-simplemachines-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 18:32:02 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 1b3048d5b19a3125814bf1f1e3aae60c6266ba66 * md5sum b04fc310d7a8f856452005d02d86a59d 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) iQEcBAABAgAGBQJQL9+YAAoJEIXCXpWhbrlNlkYIAOZQMnuHV5M2fYYn7Yh0rhOk K6Su/iL04bnzTnPF4ftTGfbTb9cIxdFxtPEKl7ClWX1fbPd9WGZB7ab6OFSbWpPT wYrlP5bil0y9ys0VmuBGtXob0IWHKMet8qr5fK4Z7Ct9nCDGS1tlKXe9vsoLCzor HcEPGzexPT36uCXaWKkvXaAJKggNrwM/Ygjzex3UWp9leBVJILx0drM358lq2a1K mWWyRKyDHp123fevCEpW/5WY77rNGnyc0evzrS4A96396cKCb/bIocDK9LbzGasV oJUXRBiWB5OOnwytbuznjYed+utIpu+RldplHOuAC9Lg64RXic94b2pb0I7ICpI= =wM9w -----END PGP SIGNATURE-----