-----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-zurmo-14.0-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-zurmo-14.0-jessie-amd64.iso b39c5959fbb1e7d0588826c3d5ed85fc $ sha1sum turnkey-zurmo-14.0-jessie-amd64.iso cdf89f13a677f24f7c65e61b58d35031cb50fc75 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV+7vlAAoJEIXCXpWhbrlN99UH/2LYRGbOzPZ8QtsIgd3CfCja gKAF/lIl/Ar5i+NDudS1KmIxhf71b850ml+9Fz0VHxlq9jrbTGsfTK1C/gnwaOdq bzszV+mMxXQzLm/BPXqRCbd9UGfaOfns8R2qC/DHI+A1WzbOKflsvu7fJn7Ei4Oj 1U9flqM1m3j7c7VhrGFwEx068NpXUdY+rvEgh0YL8G/+y0ud3zmSbTAWUBUuNzkk D+TXP0cHtNOCcYK2eHIkqec6zB9f8A62tftD45ftMBNugP0yrsoyZuwnLZXJbwmZ Nm4amK21yO4mVSlcru4BpcRH3x0Zx5UOvGRRzS8rqdh6gLtGYnRiug+SK2NoOdY= =9JTr -----END PGP SIGNATURE-----