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 debian-7-turnkey-silverstripe_13.0-1_amd64.ova.sig gpg: Signature made Wed Oct 16 10:13:38 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 5c20a9a8395cb2f1992afae27fa397b124328abb * md5sum 3334022e81e12f01091f9a74d735be16 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 v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSXmbJAAoJEIXCXpWhbrlNSLMH/0jSVx2tm+DiVtfcU4JEvm1H Mi7rbGt/w9TKZNBq4hhEc5bJcLLid5fcoGefdwL5Ww8KKywASybS/5Ha4IvTd8W6 JkVuIOi+HAdnvygp8r0s0bFMVKJXg+zgXeyIbWTL1IUPNOmK+s5SPpP9rGqOqixM v7H25pMinzDfHG+Ih57eCy+AkX3MLC0G97QI4Lv8Jqzd61Cyxi0BJi0LsgEaPxsd Yp59BbQENEeXohuEAEYi3Yhy4HQO0DOcdUNXeYlHKp5cEOZEJPEiNPPqSQqVq2TO 0f/PwwN2D3M9QagymESyAPJsz9T6WSHKXObj+E9GONgz+cPYIxRJtHZGG8u6N3M= =vSZ5 -----END PGP SIGNATURE-----