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-yiiframework-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:48:37 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum fa8cc0c1fac189991941b1f89ad80553f3fbb9f1 * md5sum 3e1058fee7da84185399627f4d79de64 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) iQEcBAABAgAGBQJSMt9tAAoJEIXCXpWhbrlNEDcH/38wUrxc30ySmuyELZxsQvd4 fJXv7EXRYZL6/beLX17Yk3ToBo9SrlRTsUvELopsndn1ivavXJJZapTnQ8hEzcen KTMw2+Jdy+RPgTV9XxMSkTnbBXE19prY4azs/LYt1ubvNaGxqgfPqzgz3JBUbmoC ez7jLmQ6FMCjbe7w9qXex8OnLlcFZN90ZF493QkqmcTD4MwREIB6MzMbHiO2b2Bp E4H8qRK/l4MXf352iBdIbGg5kl4ogMDe2jlZ2mIrjfztPVI2vWBft6H9WXyWjiDE DSZVyn5YopCQsb0CVQSvadS32PdLuuWzzCObf5wfoL0ZZ3QeRWVCTVMcDl3wIoI= =rsmG -----END PGP SIGNATURE-----