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-cakephp-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 16:55:58 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum eae7851bb39ebf12e605ec71581891525fc12eda * md5sum 1017aa2fad6234d92cdc3d5bfbe7eba7 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) iQEcBAABAgAGBQJQL8kUAAoJEIXCXpWhbrlNA54H/0PTGcTSMCepXpPUJwPAkB2r UmFh2SZoeiQsSieJG7zgyG4gQ07CBT7qK0/NH18PvHMGMjJG1sDZLeN/ugsKITT7 77F+tqeECACnKwbWw2r7mTwXM8A2jb3emg8u9bxV2IzcAlHlStJgOcxk6JxupxiF Yb35wnHDgHC095l2U7SIIPvloduCrcnPoUAw6pOmeqcSqdSPIfwFtdhRA7DYG3Pn 5zNi8RL7x8uy+hC5mML3UgGEZZBz7CzGUlPP+wVmJHfMCAX+t2sA8M3QJnyKQ4dM yBL6diP7vS4u1UlXeqpt3MX9Si5GfDH/3weneLmlkM0MBq0QZT2SiUpW2S0xgC4= =3pD9 -----END PGP SIGNATURE-----