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-mongodb-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 18:19:25 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum c89a8d94a258de35791ddd613f7549e785f91dab * md5sum eb77439f6ceac541688f2ea63ca015f1 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) iQEcBAABAgAGBQJRgVylAAoJEIXCXpWhbrlNNOYH/12HmIMDpHsT9YUAcdryqVYz V494V+yNrOrdN9z1bNrKrnbJLb0n4fqiZ3uZYvANBnsBjUm0QrZZtEXiOlnRTZcP 236jEkm9yLHraROqXZmukCXG/XS2MH514ConYxfCIgmrWvgctYkT3SA9+8uItoiT FjB1ASn48L7xGBZoVhxvvGYZBBfXoVqtLG6sXltry8ceYJ+/rcz7oBZdJw8Bapvl 14XNIpYoLxD3JjQ9goP7Hk3u6c+hJzWWY7V+XBq1xlMXkVBnbtetn1Y2b3urb281 Mso6ZYdgRZYXFU5AgiV0tnznU7t8gkyDXeaAsFtBv7NW4+olCYr54QHkgSR1/K0= =iJjY -----END PGP SIGNATURE-----