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-concrete5-13.0-wheezy-i386-vmdk.zip.sig gpg: Signature made Tue Oct 15 15:23:26 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 10826e60420d2dd5f20dbb51df8bb2b4da155d4b * md5sum 98309d991676c486fb9a505d91702c5b 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) iQEcBAABAgAGBQJSXV3jAAoJEIXCXpWhbrlNWtMIAOWR1w3WFKolG24gu6Ejf8ZD s57+rktArY3v26lyA+P0MwMne23lNGBALW3vFQm2HcxKct24k6at61WR22BHxLPG BtS21odqbLHLqyxT5XTn8/cygtde7qcaEQcUIbvkg5q6RBcNtVH9s7IfSRfJ+vzw IgqGIP/OlaVtegLKeaMido/MazfWGB7/Z/G3J3F9i3AwMdA6gw3xrrmirmV5iGIC W+xLHpfC3TmXGBkfWRSxTOOSpOPX3xtGoycFDI1ojy4iv2OhbcFKFfTi5sw5WbH5 pRDY/8gOaRJ2xeoIxvRbSv2o6xcte0QAX+amJzKxa8kC4T9ETQsgOibEchz2u1E= =mIp7 -----END PGP SIGNATURE-----