-----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 debian-8-turnkey-tomcat-apache_14.1-1_amd64.tar.gz.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 debian-8-turnkey-tomcat-apache_14.1-1_amd64.tar.gz 30d36771c601592861f976210a97ce64 $ sha1sum debian-8-turnkey-tomcat-apache_14.1-1_amd64.tar.gz 761761a5665ca77d72eb91310d8031b189b7265e -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXDJnvAAoJEIXCXpWhbrlNKU4IAJ9QNGyp4ZD+tmX2lOHXJEev askX6CjzNl74UcFSooGMXb9cOZAGzDmfhoA23OoLbGkMJ2KNq9QJ/DbAkW2VJ6z0 Fp6g9BvJun8FqNry0Jaoh4boEBRg+6egVLAav2Sa/YTZ7EH2dMPPQ4TEvE1OVWoT Rfif+WYnza+B0NtR2jkgI4OKTFTtXXmfAk9vhyISKIMAa5+w/NueHqRWDRMZUUWe yInA+25my4wgAVHQ1gSe+fT3VfZS5eEV8e1w+126bCtXyrv/bnJRtD0lMG+vv2Uc 7XxGc32F3cl6u5bulvBtZUmSKJnuUzQuePo80vEEFTsCLmN7gnobUndqzPHUbyQ= =EAse -----END PGP SIGNATURE-----