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-asp-net-apache-12.0-squeeze-x86.iso.sig gpg: Signature made Mon Aug 20 12:09:37 IDT 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum a82cace511c2c2be98fe3fea76d4d824b9cabb4e * md5sum 21695bb457886db8e749ff580862b282 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) iQEcBAABAgAGBQJQMf6/AAoJEIXCXpWhbrlNfDoIANTES7oaHujpK9R7F/xYnJNt r/pJDiIOvEhTlto1VEd7X4yBoBVJTgL8ZKIfafA7LHhe++JlWBo5X82UDCGXZL78 jEcWS/9K+6zCmxZBlk0VyiRlNhziflKl/hcHRtPYwpOzihPHVMxupZsatv1rCHuD OfI1VAjyhNrKtA2XGrVhqFJEvEKJGHMBl0ySTXDnidphrFuWOxMpbLq+bJ8pf9y9 XYZ0DC5j2E0ppgV7hu54eyO5XhGoBChGzrEkgzGX8WUR9E5NUCqJTWwEGZZGi8fn IPH+ryU0X3/hpy6Wigw5IHgefJAXdM/PUnybIMqtfa+SlYykVnJ2pAD3vtF1Is8= =Eo3v -----END PGP SIGNATURE-----