-----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.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-14.0-jessie-amd64.iso 7913858e3f5d137a7fac79b5ec6e3579 $ sha1sum turnkey-gnusocial-14.0-jessie-amd64.iso 42b251d10f84a7e58a1793f1c9a2dabe2f4fbd2b -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV+7vgAAoJEIXCXpWhbrlNI7QH/A5gLciIpHk6W0xYhcwtNAcZ +4ruGcLrW02P0Vp2iMfuA2p9ESWz+I0KyzFiGevhpA3CXF4UuhwZJ6wDYwBK1kyN ooZmWJboOGUjoakSXoh5R0l9IaG73FK425oB1u2za9nmZzTRYNTKCHGG9u0TUEoR +v1u12C6SKR/SCe9gb01tTYyDHxafSCySPoyc/ytepCB+X/3FL3tfmIP4RYFx/87 /sUWdniYOX4mRt4gaQiJVIRsR+RE6xlTTUvEb+ybJprCqmLkvvO487mYx9MZoHUK I4a45CW3U5rCoVwImFrlt1SfseyDG+iaRMuVmRgermFlK1XzyxiWW4bBCLt3QrQ= =TqYw -----END PGP SIGNATURE-----