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-symfony-12.0-squeeze-x86-ovf.zip.sig gpg: Signature made Tue Aug 21 12:30:33 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 2dfef896765e549d15b5ced43f31e04fd00a6901 * md5sum 1601cbfc8439d2586ebae316b8528b88 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) iQEcBAABAgAGBQJQM39bAAoJEIXCXpWhbrlNS9oH/jPUZI5+OSAGd4AXfsRzjZxh H6d7UMXsN/uj9HFhhDBCCW3ypPIz4dnBnvOpxyBb5mJJuld6lwmjrnRBrt3FyV2n oCzE3AgJeMKFzxhtioZ7tS0uIb4TeyoNTln80kuqIK1GFqY2pBiiYd+d7NG7uM0u Dtg+slSHFz4hlX7VDO6/Bi2lNukd3GcRQtcBeIDKA8+MbRYiFRxEYFvfmoe2VuAj QirHG+iDDQNlHO+u+33XYFrn3UsLPeCbEM5aeH8wAQ+H+Vgl5BBCeizhhJ9smf0X ZEfk8dUuz4fLEHDdhV9Wf08jiwqk9kEVIbtRU6s0XaHQyIw3lLyprgqdxXw6JWw= =gPfB -----END PGP SIGNATURE-----