-----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-piwik-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-piwik-14.1-jessie-amd64.iso c4d32673f77f627767f4284b712ebebd $ sha1sum turnkey-piwik-14.1-jessie-amd64.iso 76e1c2f868dcfda7922763272f6009ca155b6fc4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlNZbkIAJRaQ9fHP5K5xpFTKWTpFusB 72TNNzy2iRn9z/ARhqcWQzrNmSIOtP//f34wz9b4tnXgVhJQ0JaMDUaCOAu+sybx kklccAd6Ph3HoVve3cOt9XNLwT5iON0j4zTKY1bmKDD/F8sXw3S64as1IpFmtqgU MDvZ4yF58mobTHSu10eQ0aD1CgorHoLMScXuXKD98yfh1+8DgBTIBCTb+MoOSiTW JZyLbbOzwfBGjK9Box3PRhTVTKnPEwGF9/hPtC+cqgbPM7ibzuKrNk51jhXqU11i F1glCEY6KvIw50ugLbOH9d+X/OZ8NzOtB/14PX59tCxBQr30hxrgukt+8dXZNEU= =axH3 -----END PGP SIGNATURE-----