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-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:18:28 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 4c60011a35b35a3e8b37c103325e0438020853d0 * md5sum 74fda7b6d2eb0b18d54198381b464246 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) iQEcBAABAgAGBQJSMspLAAoJEIXCXpWhbrlN+xsH/0roCyjGybb4vuNdmK6hNkl+ 2WIbeIorR4V3peN/FIPlsEQIr21AZsIFvnZozDQtrN50OaCAwZUBnqnN6JuNJANG b9JdQhstTl2V/1KDvA89PMRPnkd/y69bFKrCSgot5AJE4lvJzg4kLwuZeKv/bnda rKuk/OOn4Ek9Cqhz9nqvK5M1wPpvj39NsDJKI0GO50F7yHjKgFTUBRBn+Og/s45o SiWu3nYX7aeWHYCXt19+R5vtoHa7qulp+39ggvOLw1otOkAadK3ShN9l0DW8e8x6 d7uh+6KZAQV111JREQJNEpLoyEJZBfSA9yDOJjHXNPquhewI/Gv0OYc5JuLpNHE= =ll27 -----END PGP SIGNATURE-----