-----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-observium-14.0-jessie-amd64-xen.tar.bz2.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-observium-14.0-jessie-amd64-xen.tar.bz2 5f77e953f4aae1a85ddc7b26812f491c $ sha1sum turnkey-observium-14.0-jessie-amd64-xen.tar.bz2 e8daa7b278a2260197693a6ae57f27974d87f5a9 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJWMdiBAAoJEIXCXpWhbrlNfhYH/Rf3zYzr4ULH+I6GV5Mm9g2k Z1ob5tOgxEIWGHmR/ptBu6Qz2Isu7dUGS1WjpyJi8tnmQ3sYZ3Hd+5psQsq1uVDL +EFzhYfeBPCux6CYlyV44S6xxlvQqqG5dOHp2ep7o4SNZDGJmY7BOvdlyc8ZVv7w QfY8wj5lUpI+Xf6T71J1Fc3evPyoWG0Ekvm2IdlmCfLMf0brK1W9wx+UY6U1l9nP vfU9ueXrDlvqG/QmCg0nEWMP2AGLcZrfaIPsWpwwQkW20QDPyRN5yE35ZYMug1La Ay6Wm6+VPekw03wwU+mZDGD3S9XMGmQdDY0CzFBzUwvYTb28aCFcUS5D+h504rs= =8G0E -----END PGP SIGNATURE-----