-----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-concrete5-14.1-jessie-amd64-xen.tar.bz2.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-concrete5-14.1-jessie-amd64-xen.tar.bz2 6ac6fa3c89715cae5f46128aa1d63d40 $ sha1sum turnkey-concrete5-14.1-jessie-amd64-xen.tar.bz2 b3e0eb434f352b588f253e185d24fdf9cd5de460 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXDJnxAAoJEIXCXpWhbrlN8mcH/2c0pMQlReuptllz8FQqacNs /weoRK7LxQuXZCC3CycRfyIF17twDOXtFiHN/tdxGDirbfowNbXlL8aXt8C6RGtj eU7TWItBqhZVpJIONJ3Lq6pCxGGtWctePXcsh4k90liIWSTHVU8fcZMZwooSkSw4 jXcjTZu42kejo/SIxhBiZ/CJfJi9l+x1WX267ZlNU5nN/b3+H4F1jcoJoJ6D/l6t 3s3767XyQfwCmGOgy5VLRgZLl/Pgl7OIs0sMOF4vteabTs/PQIlwT2FYJOAPn9Md bEbDkudHI6W+A+mA5uPVpPibEi0jSqFp4xjSEn88hOgiUqvS1P1axsiP/MHf7F8= =uDGg -----END PGP SIGNATURE-----