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-jenkins-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:09:41 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum cdfe8cd93bc0fee23be31a64af54fcd6b019114b * md5sum 91998462a131321b714d630a28e1fc64 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) iQEcBAABAgAGBQJSMsg5AAoJEIXCXpWhbrlNmjQH/2HU2M9yOCcYsy/csIs75udL 011ZhyMINwl1C5LVpFh5LG1D1/ZcNry1P1mdVIskqqghfR+QC+tCuNFgLhZZt39o vjZPCBrgBA/Y1Um1tjLNWkDaejBI2W75dnJF0NaH6iQuh5wtsh7RDbFBeY4uTO+f VlrWfHTGGoJXuUOIylSWhwbhKvf5vfvDyR4hXfw2ATvTJLnqsMmti5V+3pmH5PfW kwPKD34e2sSGnJyfTTd6f/uckOj4+YtMJv+T1xEIZFTPQht5bHMkYvhCyNl8bCCo DN9h2NRRswpYznD9EiraWYbQZIFgKZEsPH4BBMxF02tHJUFBZw/dojCGJlSYCGw= =XBDB -----END PGP SIGNATURE-----