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-sugarcrm-12.0-squeeze-x86.iso.sig gpg: Signature made Sat Aug 18 18:09:21 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 9a6bab753c264c0fd5033ca79fea50660bb7234c * md5sum 94cea5d0b9f60575b2acb49442bdc321 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) iQEcBAABAgAGBQJQL9pGAAoJEIXCXpWhbrlN/gwIAJNi4FBRFRkJ0Vjj88yR3hGk IuQXrstBq1+bzdJzHxqk6y+GoEro/qf+q3jPMcZCsDU4X4kCV89ILHB2m+xW7zeH INb5r2mJBDGWUMULoiQSw0CZT8pOJthjvOxTOQvcQNPCNchPuBDim6AmTqFXKzUs hu/atBQ2H9aERmhDdBXsq1gVuMbYF+BtPcTzqw2v1hkHNNuOUjnPV+9Ua6PPSgiN MHuLMTYLyG+4H6LalDruOC3foZ38czL+x551rXIRUg5aJC2zKt46W5ePtn+ouODd pYTUfNtg8tIAXxjtZn1TLMWtxYZiWLaYPkmBKMMaOHilwhttUP/e6pEjfr3dpa4= =LV2/ -----END PGP SIGNATURE-----