-----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-14.1-jessie-i386.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-gnusocial-14.1-jessie-i386.iso 981589ff4a03987d89242ef34defaa78 $ sha1sum turnkey-gnusocial-14.1-jessie-i386.iso f843d005559edbd1596a9df7c0f2b026aa4288f9 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPyAAoJEIXCXpWhbrlN7XsH/AiUhyQCEObSnSyNjPPdVCp2 kuT+C3NCOro+5BzU7yJ5XymjcSFVWyrm7ZgjVBghWgbrbkhT1dLQ4V05ynUr8dIE nR9L6ultiOLc7f6/FD/KU3Tlj4FXInkwRekRFUfIypG+7aThOksD5wxTnr4JHFGT urk6nu8yHX0qRd7CFY3eHLPKr2Iq326rIQR6D7H7+JYhMlbRt48osXG1lsMIqDot 9uvPxabYhGmPya2tnZqdUe2u0hnVI85Qw2w3+4p3RZZnNfjxSMIs3p33xABhCGqz qdhdZBKJjIFikl2Jw+h2uHAYSZzAY5ZPFY9Apg+B4OPWpTLDkTTlhBu+CN77KTg= =OFQW -----END PGP SIGNATURE-----