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-roundup-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:38:03 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 28b02e850302bd92bef875093f7bee99a21849ed * md5sum 06d7c43f7205b5e1700027817e9f6527 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) iQEcBAABAgAGBQJRgRqyAAoJEIXCXpWhbrlNM3QIAI8Ynl9L38o3saPAGlpQmPVE WicD1SELW4u9k/neQmbMibmTE4yfcHE9GFV6MMP7QjDsy6izvOlwgoQS3pIhT7bN MzPhEI4d84WhCtnikA+ySmrPnegj+ue/hqgycVrizErsyMyE7HZYimFi9yNwg2O9 KDF21J+5pLOMdP5iBeX+agXbSjJW2wWvZ0EUKfTISsrBholA2z80J9sVcfcGpqIt zmKTR/eTBH6mtRb+/Bv0ejKH+mmKosjcvlAt4zYM2fz9l/i/+IzECaV56uuJ7MzD 70YVMD/Zz9QFO/76oQuYyn6JnZP4XOXEIswo/YlQ+7u124BW3ADmNiXM7PSOSoA= =61x2 -----END PGP SIGNATURE-----