-----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-owncloud-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-owncloud-14.1-jessie-i386.iso f0630578b19e10ec3b12ed1b82ffb692 $ sha1sum turnkey-owncloud-14.1-jessie-i386.iso 6837bb443ca5faf9bdd9b5cf9b735f5df5a9bfbe -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlN3woIAKqNISl9HjHfqfnj5DzmfZBw w4BvMPZ0bcBiJpBb0UfTGrXFJr4kXDlVCNW//sB20nM1KgEKmIvInCGi9DyoYM3C RDEXBXx1nR2KI5MREYdJ5wHz0LNZ1BPLIJ+6gvyRiHb4qRr6zOsN5qGEKggcT4ND 3V9RS/SqANYqJ5AHtgDRqMceDcz8xY3T3uOY/Esq7NqkLpFElgmD/FadtIegZ1m1 eJYX6xUVv5osmE198nZVSLJyz15RVey350eozgWQ/UfDGcEYFzmvLVe99SZXAsf+ vvXqqTVGYj9CpAge2m0XMpIWtfBWuchXE922JR6ODkeBwqxyIr9EUGybtOU9X48= =7XTe -----END PGP SIGNATURE-----