-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Two steps are required to cryptographically verify image integrity. 1. By verifying the integrity of this signature file, you can be sure that the checksums included in this file are valid. $ gpg --keyserver hkp://pool.sks-keyservers.net --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-vtiger-14.1-jessie-amd64-xen.tar.bz2.sig gpg: Good signature from "Turnkey Linux Release Key" 2. By calculating the image checksum and validating the hashed value is the same as listed below, you can be sure the image was not corrupted in transit or tampered with. $ md5sum turnkey-vtiger-14.1-jessie-amd64-xen.tar.bz2 e5bfc4338c5497eabacb630e60665ea9 $ sha1sum turnkey-vtiger-14.1-jessie-amd64-xen.tar.bz2 3db1dda62748d66965b7b9e3d10716ee1a9018a3 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXDJn8AAoJEIXCXpWhbrlN9v8H/invg8Tb6NcbMNZuU43vrBOF CpB1/HL78HNPoFXoycoRivcL56kxOTCJmWvlSHLU2zhk0ptek0ynspzKQlUQENQd kG2l8BLd0EZl6HN9BAO12XnfSDZWedv/Q+NPkOSTFyATrfz4NbPpdsH5Kh71behL oY0FocoyI16tCpiTzV79Qe0cD+h0la2AcKODrUXVdpLoDFiWggimDtzfbjwwE0Lk l42vyQnkRzd61QOgHQAvoPQGF0SwQeubhMZqPlHCMnnQLSTAq8anxuOlytDE09Ag 6iN+eLVvD5AP8oWcyZVh6Cw3PtbkC1p78m7S0XHEw2XRpUjEN7XEZAipWF6BtTU= =4NbC -----END PGP SIGNATURE-----