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-b2evolution-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 12:10:05 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 12c99e350f8242a97fc0137a5f71aca70dd12418 * md5sum 91125331348b40b98a86f6f5b1a61bba 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) iQEcBAABAgAGBQJRgQYVAAoJEIXCXpWhbrlNwikH/ROF7s1GSNqe2bHGjOn7QxI6 c1lShYBnPz7Kgsco1AJ42braC3RSeQO/E6J8gpD/IBi3A4wovUPFcPwwluijdOWF utLS27pY+RrA5KY3heLWMRtwlCKjLCvwySEn0ZdgA6H2zFOL4H0qwTqZwb5rJl6M SHCaqB0VGVl0llF5uF2L0FWrEQcniXDvfD11q9IuZfusp5Vz43knxABVfQwvgWNY fuK5Vz23RCgpTMWlDKmyNwOyM5NOYkCV/HAEtC9PNfG+IKMbD2UTRVKX/WrPvEEm fUl5Lm9tFPCVL8Fyi5O/+DhO6MWcjCTvbxyWIPyRVbu545muoqC7pPEMlKXER9g= =CiHx -----END PGP SIGNATURE-----