-----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-tomatocart-14.1-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-tomatocart-14.1-jessie-amd64.iso 4acfad4a84f2057cc2a5970e1b466445 $ sha1sum turnkey-tomatocart-14.1-jessie-amd64.iso 772b380a00e5fe8699645d5b92f1b75182023dce -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP0AAoJEIXCXpWhbrlNbMEH/35FdAvmENHrteK+zDCFROeS oF6J+4i4YjDmhy71mGgw9Xvjhzl/wrTk8q5XD1cOjWug2VIUrO8K/Ry5myn12Gyn NuMAQiNpOmkr63ybHNROzOv0pq8F5dzX/GnnLS+Q9MVpf4ML3vewYG8RyyvIz2+N NhJISDqpk+ABTTP0DQsoq0QbZm5FuPqBOcp60y2Rpm/CWPI8c4h+rlk6Go5LZtP8 26v2R89Cc+F8yUaf+3fQgmN4d+3teADnzsDe0SOCM0aCSOW/orubD9PD1hqAaogw f/M6DD1Np/4BA/8l4xwrpelQmv5EqK6y1nx6XqYrprgTFHw1xtC9+udVQkScfVg= =iO20 -----END PGP SIGNATURE-----