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-13.0-wheezy-amd64.iso.sig gpg: Signature made Tue Oct 15 16:42:35 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 155be6833d449fc2299f38cf94329bb16b5dd2fe * md5sum a99d5f48aa3b6626c4fb0165449018c0 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) iQEcBAABAgAGBQJSXXBwAAoJEIXCXpWhbrlNL/EH/3niH6nEUaw8Je0JLUL+4s0/ kv9CaaHXX36EYE1XLt3tLs80QwygUPzFRVyfCVSWhPNKJ2vLZTdv2oo/OJGIOgTr 8fyAVB/puxQ6Eov0xewfpWCc/es9N3GoM00Jl65AAegXtXxFnvGtk4RI2YBrbFoi B1iLHYpCsgGw5PGhSwpQcEYYluslynITqZuLlXp13xMcYVZnNkopdl42/2a3QC1Y b0leNJ1OFXhhmOnupoIRwIfuyfo12fIzSpye/obYRtekuZY7VESArcLXTUrCvXY8 syrUBrO0yZ8WzNn21b59rcTTJCXA8+aG4u5h/L2Pk77uAjgdt1UwZELpTlxvG88= =uiuO -----END PGP SIGNATURE-----