-----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-phreebooks-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-phreebooks-14.1-jessie-i386.iso 27a175462eebd51bcc887ff23be2675c $ sha1sum turnkey-phreebooks-14.1-jessie-i386.iso 40953a69d8dd3fdcd6eceac2aec3cabc07df1565 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlNMpsH/js6faxeBQ09c5wN/lgV+CDE RNIytavLDtJIsEOJJl7CvO1hAX+KrIjUEXVvGBj6CzlhMqWy5yn5/fGQczBXUrLF V4HnMWqw6G1tLa8FylqW9DGQYv7kSoRs8pGnHMaEwL49pZXnbFmo2WxeI5emcw3f YWzGEin4rcNXXKO/7SHdBhhL69KwgHk4DaYlsaHl++gHvtQ3glGJg1HeID0zdtes 6NiGqHiSAqJa3MaEI/hx2G1tp2Nagaqw5wWp1tt9y7Fivr4AeCBHXjsJY7dRX9+b VyrQiBd8c9mB1c4e7245KBBYns54ynocRky1NKuCTguIKK6uVBZlotNBw4rsXZ4= =KYG3 -----END PGP SIGNATURE-----