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-magento-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 17:59:59 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 96049fc597756be326d3d3bbfcc6583bebb91d7d * md5sum 3ae6a9b000c66e7cfd512694bbeb6581 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) iQEcBAABAgAGBQJSXDEWAAoJEIXCXpWhbrlNvFQIAMfbJIEdhcZXDN0hKYIbmZip nzDTJ3jKeK+Na+sBBHmmNpqzPkDUURnp/+0BrYURX3hucxVITJfJK8BILNzKIhGw 0OCKRnyY1FBBw1R5PPTcacGDIj2FHFbTQBBIPZsTmp+m/dnnYfOTqV0Xv4ArdmVP +wd1vzkaMnfmPGInCmmvdXGbI9CwBy21lfN+6DFZ9wStvMr39WFJ1w93LSrzQ4qN TU88yHQusQgg1RPDlI7aRt8pXnlo1AfNiNlhaQ38w794i91jgNbyga/Os9IcHYDr 2dbDapFcVsug6t8rxh8fTEIchuWkxU6GuMXpHRdeixiK3O41Wq8tdTybTbTV5F0= =nCMU -----END PGP SIGNATURE-----