-----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-tomcat-apache-14.1-jessie-amd64.iso.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-tomcat-apache-14.1-jessie-amd64.iso 579d110bb535361598eca9a2a62f99e4 $ sha1sum turnkey-tomcat-apache-14.1-jessie-amd64.iso 634226859c88d3367c4dc193b218fc1ebcb70ce4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP0AAoJEIXCXpWhbrlN500IAMBUSmE8CdNf88Da4xlda4U0 JWmh+TkjZn9+xOjwaK6KPIRCMe3/nyQRaI8eGuIH7u1yG+G8IvYi+TZ05bwL46yO +In9kQEVxIqCwdQcfodzhN2Tb5xhD7ycZNb3LBe0Fd8DQ4lMqlLzVHmRVHLoo+SE +tzx/6xQxwwMYUwgomsAbwc4purgVFQfVXBxA7ny6Yh4yKYXPYqC3aR/5O9a1lr2 XqeAZk7KqBZOKuZlyfYactkj4Ua2ZVwtuEGiDOAdEkTkWxGwmI9XwnPk/A4QFD8A lMiXcp6RvBTOs1x9WomccPeYrm/NDQYA9cXoF8wVCLTtSyQU8sgBDOoCT8w+mXk= =E9kv -----END PGP SIGNATURE-----