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-12.1-squeeze-i386-ovf.zip.sig gpg: Signature made Wed Jun 5 00:20:45 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 3be7fdf897b566a7d832ea3ba4be04fb64124ca5 * md5sum f9a00580c0381176562bb86361aac11f 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) iQEcBAABAgAGBQJRroRNAAoJEIXCXpWhbrlN3hYIAJRMHSh4KdFWo4IQ64JpsISo bwWqHyHtSMU3pUEns1WxsaNV936lXd/ILuKY+BwH95/uUtyHnqenThVLTf2H0sCi c5Z/zA91ijasmD+oBVox75LAYylvUhgr2To4RkONoirBGPFkPJSewjuHCW4fWpPv Cmq/887Gc4LFBBggc4GN0Exr9ViRCaKx98ydpUmsBXlA+/0JA8l6FQ23OYkAm7nI fXmkvqcvyjOq71xwMa4FTPJMEE9zEGEC7k4wLtQPHJ0x5qZ7LtWgIx69cXkM8Jy6 U1DJYnoCAkyniem1B1c/nvD+QShjpJ3pxUycpLkgAcDQZiWIIPh6MRwKgDWlyDw= =uuqC -----END PGP SIGNATURE-----