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-redmine-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 14:04:51 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 328e627fa05766ccf9c32ad12cf0ee35c4bd543f * md5sum bf7c4a912c29e524df08d13ca94868d6 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) iQEcBAABAgAGBQJRb/1zAAoJEIXCXpWhbrlN7C4H/joU+GPkUXheCZFW0Gcfy0Pr yXo7Wr71twPb6vN0k9y50GIX7vyupF0cw6bSq8G+/+zGyHDZqlql/MTMEaO4i7rF Db7XpHMN01C5N1EilubdfkTj9qQWcR+mLwl2f9AgdF4YDjGIye8PbEL8YcoJyIJ7 0priZt7KczgwuT419m+3FLT7ccfQga7OaVlTcja38g0EuQCyCx0w+0X1WtSHE7BS HsNQqr0Dttva4D7cbicQWNqEip0PudSWYl3phIQyJ4CJevowykzMVUPet26F4NoV 2PVu4YlRjJ7IB2Uolq4UZ4sLbmdstD8LFzmSfY9LQmhP7h6GfRZx4a51gETmwmw= =cVuN -----END PGP SIGNATURE-----