-----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-domain-controller-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-domain-controller-14.1-jessie-i386.iso f45344285c1b2949755c89f1519ba257 $ sha1sum turnkey-domain-controller-14.1-jessie-i386.iso d412e2a29eb4f1af240e0da5d301cd0b3efff02e -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPxAAoJEIXCXpWhbrlNYB8H/jC7//pn19RxWdWRIGqQSacT cjyhUNK9J+i6PwU2tO2TQ+4FsdcqG7RU2/u3a8/JM5FBoROtgUEwtBDg3VFJUa88 hJMEhmF0sj259vp/0ToU8S5GLMKPqjobSMY4q/TulhSHWuVYUMAz/mQDbnkxZCbb 4XDT5rxyhdW1aZGXlt1lXlFqZx28HT4alGyZnpCdqz2vvpfiBeaDth2poPyIOF8V VyACdmmzJ+un7XNM4I24jBVMRjg8GFRCSC60Ul80t/cyJslmY4P6UjSyB9shnwL8 vBSfEILPlzxU+5ZpWeYQho5/1ev16pwKT4M8Pp+5AznrR/aa3CaL9j8Urnt6iV0= =8JGg -----END PGP SIGNATURE-----