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-lighttpd-php-fastcgi-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 12:49:33 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum eedaac1334351e9ec8fb34409db07854e5aed4a7 * md5sum 0fc4367c6fead252d6428b2d578af86a 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) iQEcBAABAgAGBQJRgQ9VAAoJEIXCXpWhbrlNDQAIAN5pdG6xMk9U0TrjfD4jxiIR JGPO23y+sTXGaNW152M7Q4s3TNkMRov+noNpLMibBSIhe5+PrM0kr7o0wy393/bw Yi1U4gwGb+fCA4yZ22atMUpOuOBRgez+IToJExbTMXkCjFwfJpEB0rb7OqjjY4MD tW4hIdumJ3ZBhNZ0Rcaf3c3WoFu+50ILnklbj0u87nrmWf/Ptr/75E62ZtXqxfJR uJqm7GDRAucvWqXxUk2Jjtd3UMu5NuA4D2VLxlSdG/UAXIiDL3ItjdEFcav4kJK8 /lk8nDWOf19x8Uh2dVf08uM/DMbLEgzr87pyenrPvOtMTeqoqcJZ7uiPteZyciE= =vZvO -----END PGP SIGNATURE-----