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-appengine-java-12.1-squeeze-i386-vmdk.zip.sig gpg: Signature made Tue Jun 4 19:50:55 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 072a5581432e02571093780656a79274eb9bdb83 * md5sum 8a5afc78630b7f66e95a6ac7ec4753e5 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) iQEcBAABAgAGBQJRrkUJAAoJEIXCXpWhbrlNWnoH/0AMEYPLZShYIeVh7vx0sQyW CgUhHaa8jnQzjzvAMO2Uaxofgy5AH5FfNCD8+9zzUzHklIVr54JDjJe79PHNuZmH jGJ8k5zDH5b3J287itLk4Hrjat68xn3zGrrYhX+Z6hkUap322dAGLPbqTR0l/umg CyBe9zDJHgh9gYEjzdDi6tEFMYCsC8A16ul7SVF8hDVYfDhbpHWz0bD263I33bAa VV859Ezr6R6uBSTl7iuJ10xp/h+zpLpATxcykmAkjf+NvEJXEpOfkUl0NK/fc1Tv LBYZzbiOOXH3iZfxBcDsZVNWEBlAH0T7jTV2wcsqMW8cnLbDcihWEvQ6uJLsn7k= =V5I6 -----END PGP SIGNATURE-----