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-amd64.iso.sig gpg: Signature made Wed May 1 16:45:21 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum da78e286b41e61697039eae4433d4a79610055b9 * md5sum a8f6e1a3177d07aa775af9bd3c4bc2f3 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) iQEcBAABAgAGBQJRgUaYAAoJEIXCXpWhbrlNez4H/2TqA9bV4mozI6ysxiGz6w8J vVBMSgxjJKMzbBEKHO2N8blFXhxvn3xr6Gd4ZHaqgRjyyZzy7YGAtxrytBDQ1CQb 8xbTa0m2TIUVFV7ye34YgltJzT8uY/5OIhHkLhl6cN+gAzyD7lXsF1yMp5wNk+/W apytwb38jX3I9xLEp79kVa539UiiMyI5YYBPUOLYjUNZ9hGnU82mzFPPHvBVucce hwnesP7yNdA0evPnQr7NpMP9yh2yYvU2qIo9kuYkFSlfmPg4ct4T3NLUuK6cbTu/ WoNGT7iJf5rTn6OJXFBJRK+HMIPQWnUs9FYiZOGrpUuCHU8mW6qSjowjhmoU/MU= =9q6B -----END PGP SIGNATURE-----