-----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-phpbb-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-phpbb-14.1-jessie-amd64.iso 34c70c206bfdc2e4ecbe4b7abfc70bbb $ sha1sum turnkey-phpbb-14.1-jessie-amd64.iso eab782db510665b9cb64cfbad5ac88f714de22b1 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlN4AMIAMu0X55aOuk1/Uacl32JlsoK XP9tGpFRcdpDFY5I5srhZU2kl5/ggFgDxGUA/arOtGQnDTBeuFfmYthj9tj2F70H WGviG2o7Kqyq9g2YOKynjwk/jPTYP0ibu51Sn/mqbmV4yFCeElofCAQrSDP02hoy Pc7P2seCm1KSwL1Qeg0v72KCfFbo+sU0jMBJzp1ETrwrEcWomhzBKhn5WuJHjpar zQ+EBz590saiygGjn/WddsWc00TX8QmEzV94JYLVWSofM2qion45RicilXEVcLki qdhxwUYl33BZfWWNTW895KuYG8e0QcHkRtkHPrCvUx9quLlLcYOu7aqCSln5P7E= =KzLO -----END PGP SIGNATURE-----