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-processmaker-12.0-squeeze-x86-vmdk.zip.sig gpg: Signature made Tue Aug 21 12:19:23 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum 0df949f24f11e82c1ead35d765bbae9816164472 * md5sum f0017a7bed725f0b27726b7374d7981b 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) iQEcBAABAgAGBQJQM3y/AAoJEIXCXpWhbrlNmGIH/2dEgYYX4P4xWN2JrhfFM6Tw P3PKt2dLHyWbVbE5CwJGMw6KhcTXiItSmYGgzeNoepUT8qZD0BAbtUtsMKorwZZm larHxYaDABOEkHHFJoml30Tg9PtcNU1jIFTqCirZnwan1xcb3kv96aWqev6w9PPJ /tXeXjHPDnh7TCL2doxT7pZs53KY84hApru29yruYeQ4w89maBWDQu1QJI7beqgH Wj3pDDPUK+0LPi1nFwHcth625XZO6kdV9eJNzcFQGMukgJlYC0Rv07691HladJjD ZqMcOAj0DCdZnvvwVp+B6uqv9nsPHnItAO6zAgTNwP9DQWzoDmmGh6hwaw7L/vk= =87pG -----END PGP SIGNATURE-----