-----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-rails-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-rails-14.1-jessie-amd64.iso 37f13d1868fc411d0cc4a1ba6195eee0 $ sha1sum turnkey-rails-14.1-jessie-amd64.iso 0b71c5ae3ca9dfbb9ba7c3acbfe6c4abd8cacabb -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP0AAoJEIXCXpWhbrlNyhQIAI5IKpuogCku1l7lsAhZfiZD iOWk5h2pO7o8EGmHxJvZwtn0NtbWqaYLnpJzJNaPyjFBNayVRJzp3cG+CmIJPLek 3q5aIxpX0d3AV1f7ZsZ2IX2/fd/BCOOAXM53PO8KB6MDRzfS7lRnwKaYK3nwZYmj gI0bvFqAfgXRfJU+F/K57kCfIromCD4l0Tz2cNoZLtOYZi/GPwxdNbu/8Iq6ozko c5MWn3xLUuC7Z/snk95lKyMM9nBKaD5G/1680dgypajfcNhby3V5PPViAz9/7eFy J/G/K3acAjirL5VE4KIdbKvLape6+ueUWzgkMG8PFAuYwnrX6cfk1wgIhz9oy34= =Ote8 -----END PGP SIGNATURE-----