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-amd64.iso.sig gpg: Signature made Wed May 1 12:14:32 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 301050f9ac1a08822090dcdd0e8e46e8da0311bb * md5sum afe4ef414e6792734cf4855a80eb014f 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) iQEcBAABAgAGBQJRgQcfAAoJEIXCXpWhbrlNMYUIAINt+TUL+KmEUykGnxRET9xm xleqcWWYG2r6B7IRG9md/hXfeISaUZCHiZmilShPZpNJ4672Ik4/tlSPkBD2EIWc vlHM2CckDMjZayAB5x8n7aNOalS2AelDNtPQ2HeSFNoz68+7Gs/bJXuzv1H5eSTe OcUAnOHldQcBt2nUDqvuC2/367UrgROQrx51CbS6nZR+EbJJD1zU/Z0lidRyM3Hq uwGD4xeZ/EBehyEaDjdl03DuJZ/a2ZSnYx4sJjvXvDkMyonPjJKpLVy8mHgWByII xpOaaxCkIQtSXtp84heoywVtUPAgsZ6hk3uTUdxcpHljAy+smC9oHBQJk19H6f8= =0ToI -----END PGP SIGNATURE-----