-----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-typo3-14.0-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-typo3-14.0-jessie-amd64.iso 99a4784add28f1692b09a520a122bdb1 $ sha1sum turnkey-typo3-14.0-jessie-amd64.iso bf39c43e6564381743a4428311a227bdfca6c49f -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV7BrqAAoJEIXCXpWhbrlNRR4IAMi1BKFmJWGGAjR1lMP8D0He TitDsM+oKygdbD4cqJ5dm9OSzO8A1XTQxUFezaHNUR4u9LFN6e13D4ujFSh29MgY RW6lKFmahd3Y7MrNQV7WNgdr3famHauG4vC6qmhchZyCGcWfNLGu1VewJeU5gtjf ozu2joxPcqptHSdfyinbRGJ4pUYZwzIS+89N9Yw6YVjSTAxEPiNB6/M5d/ZTWE0D kduENYPp/ag5wgMuQWI+8Wc/Auj6IXwaKR8Kf1quxME1kuC4DDSjHQj1kaxTGNtg c8OESQ1Az+b+DHqMR/t3fKZnmt+zdMek9gjqF17HGWnLd4264quFpuExnBR38fY= =4Uoi -----END PGP SIGNATURE-----