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-mysql-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:06:15 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 9d2df3f7b2b803de1784d09f507ea2578953a154 * md5sum 35d210a96011d4a33815a5d84e80327e 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) iQEcBAABAgAGBQJRgRM9AAoJEIXCXpWhbrlNqMQIAM5N0Ttc39QHF/s+kFkeKY5n 94Mwh0XGdvwUGriX3hF1pM3rVN7e43f8xhZWOAFazfzhSLnm1Srn/X02NSbcO2XY HwB+G75tDxkKvusp5DmN40k6OnERzM0YXWwc1+8TzZmDmKUL5UQXWHbifZ20EM6e GD/8egJeavhBgFVFoSVeoIGW7eVCWzKakRRw4dhg11vIdbMf87tFXz1m3pnxwFZK /6c4odnha/HZuWrx7bTyofJYwr8ZhBxeqBhAPi3bnwuDUFND7NaE1lvH83l/CEUc MufeBGhT/XgT3BqrfuMci6jZKY9vnA5XAIn0/j4KOOn+40EPEfhlurXxITLJoRg= =QNG/ -----END PGP SIGNATURE-----