-----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-piwik-14.1-jessie-i386.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-piwik-14.1-jessie-i386.iso c751947681a629a09a4564839259f4a1 $ sha1sum turnkey-piwik-14.1-jessie-i386.iso 0c838cb20d1239da18dbf3f1e87007c00fe2d443 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlNxIQIAKYULQD1VS+wZrTexclb3Mp7 ZAbFsVzBymJOQIrvO4uPm0C3cP6ybly8XhXlEU37a0vUOroskUDsEjMhIflGDz4p /fYNruwh0SCqJp1gZFaVZECZO2/vxpAiUMujNetJN6VKi2lcsgFTlpKhKcOLFtr1 Q1jIUmVzFnJJ3k4Wn+8wPUzPSnK2H+Xv/zZOr6qKCoyl5Rjl3OHskEHN/ngX6Cz0 SeHLf0Rpfuuk2AqP/Vr6CTgQuwxYkoNFxRTqZxk7cAzXwWgvOX2UBWuNc2l08pPx p4dGbmG6pawILNIjgvXFlN+AJQDKrqEH17wLvGsAWG3ssryUJZTfem0UGcLCHLw= =qHU9 -----END PGP SIGNATURE-----