-----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-phreebooks-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-phreebooks-14.0-jessie-amd64.iso 44c4c10236e7019196371105a39a1c0c $ sha1sum turnkey-phreebooks-14.0-jessie-amd64.iso 3ebc2e0831017681275a938d4dd2366dc814430d -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV8YyZAAoJEIXCXpWhbrlN0IYH/3nhOQ2T0S2pa3XG+UCKmheL JVi5ZkAsilNnbKCZtkuphaWDi3tecriio4Hkl9jBwwBkocMLOe6tG/UShugV7iY8 zve3YP4ulsC2swkfV/wfFscYMnVwYrrNNblp26mnEvrpvGDQ9CIV9CtnOVz/b6K9 VwaOcQWWnMJ6yG6hVYeARLFvnufkYsWPGgEUw9KxzUIxyIrXDGzhf3fVkVnbxLdm U1AcR85LyBfnjl9yJyHb7LrEiN+/scUe6rCfkPJqtMWe0cg64wp1+ZFQfNHVu3AH Hc0sfIZJjToF9vE2tWrXZOUUm4u73OdLz9sKQO+b+Zt5cVbeoK5nzHA7He/bkcA= =G3od -----END PGP SIGNATURE-----