-----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-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-14.1-jessie-amd64.iso eec9eae9ad2d5214892f23e9585ab33b $ sha1sum turnkey-tomcat-14.1-jessie-amd64.iso 39ed22135e3d9f2de85c714bfbfafdcd18e37136 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP0AAoJEIXCXpWhbrlNxoQH/jSRh6IyeKnPiHAwKBkzN0Gg 2mR1ISnXZRhF0H0ulByPa6/rOf7AvfTfQKGTEK5qf+CFBbAtUeqUHOnciBOpYu03 vMW9FQlEEfuhyx1+EuEhtkbONZov/qUo0mYb3pWL/LlpdRfOyZG3dsZtO/XMd1C2 vXpAUcMJLz3XeqWb6q8m+oGiY7pciq2K8Qtk0ZkwdTWejs7hKl8JC51puKykfBBO 0LwReUalY6IYZmzQo5rV9Vy8uRPZZlByhYYFJsITaWdkNzgW6dTJJaxFNqpL3fff nrd2JXCTCkOzFw/PpoLJHIBtjqOc7lqO4Bx54PH6CylUMMZ74p3BeiXfAUAl2lk= =u82y -----END PGP SIGNATURE-----