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-nginx-php-fastcgi-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 08:18:50 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 2212b30381d502cc04e498aaab56050da7293bdb * md5sum a3f37283916dc20e4db36c2d2cd9142c 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 v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSAgLhAAoJEIXCXpWhbrlNJ4QIAKwe144DJniEhVjNoNJdjM0r 4TMDIQ+uVEvlgF1BopGQeqSa9urtc3KcpOu+OgIz0PlDLPMuSHa3m04p+LRVUvXa 0ObJ6SXf50HCFAZGPjtym7j6jLjnUjoHjL9MpRTklZTN9pg1Ky6KCf5L3P+EKXch 75ZZ1AzbI5ewa/3QEndh90ckdYmw5VySYvvpe9fuWFhmfAd3pbMw7j7vrL90t1uC YFzCw64xnMuz1CfUbZnvexDd8aU7EEaumUA5a259zrbs+4wn+rfs3q9aCKzQ5yw+ qPZg7ApZAi7cT9B4OEtq2RSVX6aRQ3zyo438FzoZLVpqsjfPHtfoOmALS/zhl1Y= =Gz5G -----END PGP SIGNATURE-----