-----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-gnusocial-14.0-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-gnusocial-14.0-jessie-amd64-xen.tar.bz2 4ef98e113087b9cbd89d4bbd522cb5ce $ sha1sum turnkey-gnusocial-14.0-jessie-amd64-xen.tar.bz2 7e939b5b9cfc111d685b85ff96f71e1fb2c5f26a -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJWMdiBAAoJEIXCXpWhbrlNJ0wIAOamqUg0FHlwtnxH/FHr3OGm X7KQAXJe1eoDHoDFdNL8RWmFZlrGSPm0talkv4mCelfapBmjSspo+AlgKO4AO6aP SGxKJcb35nav00Z5JnZTrEExJiAthMqAK2WQy7I5PkVgYimqSKjvJiiTKBU2Maja r4izmtxhOCIjc0KWGwxXG2WIF2wdBSAr0lJbqFMRdKuP8DpvbdKr5ipOKs3JfsC2 RcIY1Ypb757q9BJqqB95MMM/QP+w4Zcry/zd6YA8Yr9fZ5v64FnHCnVYz04PbIdk fAlcfz75M4jziiBgltiINPiwI/7nlhlAyKTwEQP6TJkbsdjhgekcUsRh4t4v/3I= =wwIb -----END PGP SIGNATURE-----