This signature file may be used to cryptographically verify file integrity, like this:: $ gpg --keyserver hkp://keyserver.ubuntu.com --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-sugarcrm-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 14:05:39 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2736171d6ef42af154230e908018569202167402 * md5sum 9c6d8de025ddede97a9cf61f974a09ce You can calculate these on your end and compare to check for errors, but cryptographic verification is recommended for security reasons. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJRb/2oAAoJEIXCXpWhbrlNWyQH/3oI3UVrHpWDWgTLiog3Fu1T JTCq27qNuMg26WmIRv0DBvKKokJjR5motiszhrc37PVUEITX9xQblQ1q185SzmO5 Hx/FZzDPKOnl3M3KQkn6ih2+a2EZxLhiPSZzZPrYTlG2HL6pL8znNk543I6ZcV4H OVTcavbHoOrM8E5UBvfS5DM0DQa7nYe08gKPZ5EcZvCsEei5WxqX+ACRXyWR4pwD TbGGJQm5U7o9+zvPh3evHXnoF8abl28hCk2IbiQPqyLhiehaOBoUYCV4XEIqOxP0 33ZUb+Gxyihi/tECUNQ8Gs844gaqxNrXuhRQySCQhN6NN9E48qX5sSJKhby8XtI= =D2JL -----END PGP SIGNATURE-----