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-bugzilla-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 13:22:11 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 51517b8f39accf556bb0d121f0b1137c5e0ae4c8 * md5sum 7ad7f3332d45cba78ee74fbdaec6bd94 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) iQEcBAABAgAGBQJRb/NzAAoJEIXCXpWhbrlNxK8H/izzhzY52TEqsRxP1xb3iHGJ hEh2R8O5axZjYwFgFrqp5wW5DZ+sg5sWBkg1Kb8Z3K/kBMAIM/R/c4ZLnl50zsvj H8xCn167Hn77C2vl0dit74VeeOwbIvV954he34C3bkAPI51QkbRxDSRJmOWoBCGC tFYBF1t8CjQhO2wD0pBsgP13scRmhkxJBFMR5Uo37N88G001CBS/LyUu6uQtJ1+h KyccXMLVmGAHlUk1SmYzX0qyvucvSzYj7bsRJa7j+4Jmdc+q8Hy+avoMle4bEm2d RIYkW6pybQBwVGOcjjEctwcl8rq3SEhOU1WTxL653BwhmKi4hpv4lRluw2i3+II= =Fd75 -----END PGP SIGNATURE-----