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-silverstripe-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 15:19:22 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 9d8b44d9259b410675f29972797cf4199bbb41c1 * md5sum 42fac40f81f3cecbf1200a815285a5c1 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) iQEcBAABAgAGBQJRcA7vAAoJEIXCXpWhbrlNTYgH/3fpFM1cTSzwsR6DOHq2w3l+ kxQ73yPjShjuuu7aQfcwvaPVfTJ3dVE17HD1eN/MP8MId6zvgR6phXHanjgUn/YP hhWLLk4bok1QqHKzoV59+Xiz6Ow/myBy2/MTODHsL2uFsBYsYmEtg/0WSHXB8bMZ qFkCQ5RZNdSnwVw43u9s+u4f0UcytslGkjsK6JVvX3AxIKVu+f99wjo1ByMJhtQl CpUR7qMF16LD8nXEQ6IVT/lpMZPBW8cXcWy1drwKvV2RY8L5xhv39DrgRlvyhQ/s kV49/rltHZhkHUOCS402y2T/8g5zn9l+7qI3GLPaMHCw63R8WUvAbFvzlYEwm0A= =qXUh -----END PGP SIGNATURE-----