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-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 07:34:38 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 35f1f4edce0c21ab1c2463f40690f66ee3a11d94 * md5sum 87d40946612ea4f68cab988e5406895f 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) iQEcBAABAgAGBQJSMsAHAAoJEIXCXpWhbrlNidsH/Rc9JgrNzcEF+L9ihqxTg/OM Zv8wpapOzCCzFgt7Z0tXH+LRA33X+AinUWW1kiaLzK7rY50i7oLvHuDj83zRWuAS Ao/74EQ2cnJXHnMn86ETmj+MlzrTvGJXh6N0T63pzrL/P7f44OgajLPvZOYKvATO 0pBuAAc6IEA7K301JDrqPPJdJ6JthDGGwegYu4tBELqMtM6a6orBj12Uaf1gGlqA GwgOl3KEaa6SknixpUCHb+JczKfm8e51dp+E/ubM9EiywA7aoHBIZZNYdvkdYVQe HFcdVl/66ijtHau79a1kSQT6dLqL50PH/OxhwOtUoVJESD9fSvRnznRmKFb7c5s= =AFiG -----END PGP SIGNATURE-----