-----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-bugzilla-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-bugzilla-14.1-jessie-amd64.iso a01fa470fbfb4bbfc7261c1defe6ab06 $ sha1sum turnkey-bugzilla-14.1-jessie-amd64.iso f71492ff70a4ff2902ce06f01bd6dbbb608a083b -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPwAAoJEIXCXpWhbrlNsIEH/1Jx5ywVdtb38xyL1PUvbBok hJICoYiJIdQaGHEoTWLpuiLfwutBL8F9TcnIAr0jpLKKKp3N5K3p9TwtLKGtRQRM 1h2EhS/9ijVHbvH6+T5dCk0qru9+ipByL+IlDDBN7pd23VB2V59Rj7W0N9T3ZpSa J9AhojsLz+82+KPGl1dyB2lwpc29SiB28I/2Ia59U3XSE7LIo/vAhE5C+N9svLyy M8Iwct/OPFRqanL7DZK3ePMy44d9+HdRxklc3OZ4Lxk6YPXItJk4jdqZmBMv05iV M44uRJz1+gXmAEW8AkVxrt9OKPtBZOt4G7AFhmbpXQOc/1lYjF18/0iH1XiQ+Oc= =9WbK -----END PGP SIGNATURE-----