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-punbb-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 17:56:48 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 7e6d53d0922cc9d5460b7da39ad0b83da901a41a * md5sum 7a7c65f03872ebd518b19ee695d26817 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) iQEcBAABAgAGBQJQL9dXAAoJEIXCXpWhbrlNnOIH/0fJC6GPnaXvQ3UD2n2O1QXl cfeob56BSguVo1RQQm1mhvqe7XudtDVW+9Ip6XZrw/jZsQUNk3fGuLu8XErIucyg OAFgjjmYv1F38uPZRjZhKKCuReZgkFCREn0kzIn8jK4IRRRV0aMCz52zrYhjcmKe vE5cnId75MlxgX+KKfgxnjvXZ6LhmhpI2p1c/lUrTjeniXMYHu8dQpRpH1I7HlQl 9c4hT9QYLaRYDYrbgmSpaZ6nfvMeFlPo/aGOkP5SFJu6yxH6ey0q7Ii8Y7hpqQ/f xHq/IwtYe8rL9BqS13SADkZ1o4s9hS7+bg+90c5CGA56vgMy+jGUSRVaWg42Q/w= =afbM -----END PGP SIGNATURE-----