-----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-moodle-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-moodle-14.0-jessie-amd64.iso 7fee7d6806daa0261ed2dbe44071a6d5 $ sha1sum turnkey-moodle-14.0-jessie-amd64.iso 5f610dfaff4424d5c66000ffc258b3945b8b2d2a -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJV7BrpAAoJEIXCXpWhbrlN9bsIAILr2JzGZlOFwIos0vMnNz7g HxmCQjHtAbDCzY0IRoGm7etCTHpmTbm1t+TtP5n2s660Irq0b47qbTrQ+TofBth5 KdP48WkMWDYUy1bovm7m+ifW2Z48tJZoYEcLhTYmeFL1AZ2pvNIdDk1yaVquwST+ ycOcHOsU8vtvtjxBzBRqLZIGxe472O6OknM/RjeFJdfxiELv0XmW+7sdbVn2VZpD 6vCRfKs8DAUd0U4mwyC1i4Rrfv/OGngHkjgwoVgi9yGesgP5ayqYsfqOAJTplk1s DgV7kN9i2B3G4W/YbHSWWnk+RT61b7lyONUNmR/Ap973XV99UgzkTPhe+3Cnh9E= =YoxE -----END PGP SIGNATURE-----