-----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-14.0-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-rails-14.0-jessie-amd64.iso 7715e673f2c6e335511039d80165c2a7 $ sha1sum turnkey-rails-14.0-jessie-amd64.iso e880a8fbe88e89624adcf2118e62e39cfbd0d987 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV7BrqAAoJEIXCXpWhbrlNg/gIANb7RSJrKJnMl7hMMrV4wZul BySaGLAVhgJk3VgT0FHh2oJnrIWeYgoz5soJnJhQnEUbpXOOqrLhz1uXdlpn0zfA sJM9gyQp+GmGWkTAL8vAU+zj0mF56/jTDBJOMgThnoKG5VgUba41OZ00Fayhvcsy ir9A5p1+AaJWuTXlFtxZzb9SrtSKMGjQZZs6W5h72h5xggEE+IRkBdLPxFpTmZKz EThwQRqyrOr4Jh+sGoWSKu/4AxEuKvRS29+CAATRdogG3f1/mt6x1lk7UWl8eRVm qJRjTr0fQtF2+sKbS4XuN0aKcjK6CM98MbLI/A9xoaEvHbUimfsPF+Nf/G0Su5I= =0IYk -----END PGP SIGNATURE-----