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-punbb-13.0-wheezy-amd64.iso.sig gpg: Signature made Tue Oct 15 16:22:18 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum bd0930a5211738e063235ed0672a95cc076b5329 * md5sum 49fc82f2994e83ed429477f76b438cfe 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 v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSXWuwAAoJEIXCXpWhbrlNPgYIAOSE2enFmeqkKMzAW3gNA4VX 88xZPkKR+jW8pNLZSoPymoO1S9ZJHAqzQXjAtWsHzCbfSbYF/pbDGh4I9wd2SJMB 95NcP3s048T4B36DCfjpsz/7uZhWuX1mLYK4MwukPOmve34L/Ks10ozw/9eGZvdh EOIFX3RLGzDrKf0Y4FVfSAULBIxuXtRrUM+PnLsDmM/6DOIQTIVQQRRLI3iVQz/s 4HVpWY2yGIRV1dMnrbZj1S1dqKE6WyzzSxxg4uBt/igsTbQLGD8EW9WSb0PzFGOn TTLKiwLaEo66PCCsRvXNrsrcEkjnoKwpXBXYW+yn5kJjEyaIaRHiDttdR6GPQjY= =lBmQ -----END PGP SIGNATURE-----