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-limesurvey-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 16:08:09 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum e3a25cd630c5bb24ebcba0d83476799d2a42e8d0 * md5sum d6fce5d9ab69dad2363af4b59293b9b6 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) iQEcBAABAgAGBQJRgT3fAAoJEIXCXpWhbrlNRs4IALVqtyIBkBRrLV20Cy/bp/2q dVMDk1W6e9K5gk5nnajvqmp70CXf+ENeJ46S2R4yXHLyJhNF6BaHw0+VJOjdx6x1 bCs8ADI2yR3Oj59GNae/rKvTXPt/vUntRA9Lz97wpd9Asqmev96eVxxcYzigbc3W 7Mjvl+CiVU6nFkUKJz31INtV7NSXcqBimZyfMQAEX0HaFy4wmLiFPuX4cCQprHuZ vi4qKlPFge3FvkcePPEgH8Te/eS//MRDx+JqPaubSlb1mcTMeJNmUsRe4H5a5xef aRV52Y2vDpEsyn/sx9KiNl9WHHalp68nAVNE3aUQ9yeo8XaVuzd/FRGohVUQPjo= =+5/3 -----END PGP SIGNATURE-----