-----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-punbb-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-punbb-14.1-jessie-amd64.iso ac2ddb1537a3c088983b93ff2e3b736f $ sha1sum turnkey-punbb-14.1-jessie-amd64.iso 36e5e4876122fc1af692a7489ad467bd3e76634a -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP0AAoJEIXCXpWhbrlNlXYIALnNG19HS255+fE8EL+EWWdF f2UxAZVKDC/Pu+OyXooz5cw7qYQ1ikPGrqGSbPtrk5M93wMw2mbKQGc4Cnurgb9y klUpJGVC3eGC1hJQX98kNMd2kUwRfdMG5TyRzeU/wIiPj0rQxIlJU1My93ogtVaQ osbeP+IG2xu7zuHa9oNDeMaNYioNEzKaHYcPJyp1blVS8LBIndeQXzM4Z+15FXtX Oa3Lt3zNqLh6XQOpwoKQKxrLND6Do9nt8JJS//8P9X8TzjPA93VDC/1Os9ygw6yC V1Ukqo2PYM8xyprY4ePaYeWKZdsk0c/FylLtpGoVnlhwakWIcfIvEYtLqqNTcPU= =cuQ+ -----END PGP SIGNATURE-----