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-drupal6-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 12:29:47 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum abacffce87829d4c4163779e46563aa742cbaf48 * md5sum 8954f96fb7678ad26b56e02ca2f60200 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) iQEcBAABAgAGBQJRgQqyAAoJEIXCXpWhbrlN9V4IALpJd44VdqDB5kupErs85C1G YFQjFpZByU2SU4NC5V630ASQlQ5GagPgJgCZoUe+IWAIKFWbqH2gkB1lA6PIBlKy djIp1UswSHComO8mdrkPWnwC6iF4ZRRAI+NfKh9DNARCosXC8jBoQfwtvBdTjAk3 K2Mdrb0q55duEWHal0BY5nyXG6Aewr2fxqdyRAHiVqDEewDLyIkUDldSfnc6KS5M /BGy0oGvn8UFolP2/SdGdk2QG8aML1v/fynFCqxMzZX2x2jYcUU0w1x2LKLVpX7b XmNPnmEfqAM9a9H2TQP/MsSiBwPZgKtvoWLORdaULYRpfazQKEgodR8e94srnn0= =iF38 -----END PGP SIGNATURE-----