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-domain-controller-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 12:26:28 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 5f69b02ca4bee3b3a431071dee362d0bd3063d04 * md5sum f2563299ceea9fb012e5131113dfac47 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) iQEcBAABAgAGBQJRgQnrAAoJEIXCXpWhbrlN4x4H/12R+V/Oq37ue+Fh3uur7iV0 wqiIyUjK0SiE2jC3JYQhkL2l5y+GrXerNlyQeNNXMV603qoMqaBcw5kkYZVvSTbK SVsYHkMrlkCMOWnlFSzdYu99sqUfJhrZgugTKmfAClA0d3CgZvMSPhlYYcV3gPRt otUxB2OxeAPV5YK7sBpkSDJNcNy+SuOjhGJ7ULK1/qFZrOlPhuD+x8A80E/jXyHM wH3LlSSYSm+mfQsSpHjABg7D7QA7MjuG3uMtAkcD96Nioksjk2Wkn1oqDQX2mCPx DAXwe8WDDOs25zNMwEs4q8+aYdMFlhY80tvZNJHKFdlKBgf2S9hEfUHRbLyLGMA= =2CbH -----END PGP SIGNATURE-----