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-joomla25-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 17:41:32 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum d2da2bc8b2af8fcd5d9d31ebdc9765517028f1ad * md5sum 61559a612ea1f0d5153f31a13cb85606 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) iQEcBAABAgAGBQJQL9PDAAoJEIXCXpWhbrlNSK8H/ixdbCtSiDR1c8i5Eylv454f HRyYrvv13t08SVEsihRson8YS8ePA+7Uh0viDLkmq6pftFo2AEBHp48Kg/0DR1Qf 2keL6Lzqi/NVoJjAxlEERyqUFT6oe5FCGCPYaE/1p84xCNPnoR7rBFDGgDUzEKLg 3NCVtZgyt42pjWA0E+teq5CRO2zKeTPGEJDd9BOVyoLP89ccZonQ+fh41+cWmlKB Uhuut7VUie4oYnmukHH+THF2Dtm94ki1ToUUGAM4ojwXCRYcJAioIHrD58xk07Jh MhWq6SdFSp26KCSoBr17PjCwKvqk2H/gG+UGJg1xFeYCk1nFqcq5Kd0pS2+Z3Pc= =zaQg -----END PGP SIGNATURE-----