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 debian-6-turnkey-appengine-java_12.1-1_amd64.tar.gz.sig gpg: Signature made Tue Jun 4 12:42:49 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 726f63552fc7607ad6ce1791dd01df824effc78d * md5sum 804fb327790f664968e88b68e31e2680 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) iQEcBAABAgAGBQJRreC7AAoJEIXCXpWhbrlNk6QIANjHDdcTkL9to5tEqPfPcRgL PNYU8/qxFy0qH9SyOF3aOF/deH1xchzCwHnHiAeZw03k+weYewLhVZL/U4buMgmV KwAjwJ2Fx8Of39qryUWAawoTAS1d1hINcAn4nsv9Ks01TzWg5B0WrtYwwCRpmmnq vk9Y1nSD3jKsO5dF0MD3iGk9UAaEPP0QSj/cWSpWejKbhsIJMCvG9RAiD6V7h9SI QNl27sZUdrWQVfAN1XD1lvyspM5kKOI45EmsWqnK82wxl9j5XVUK4l0PqxSN8U9f ZVTXieyBCHW2QdyAmcrapOwt1T95WG8eS6zuWAtVLR3LEmr32eAs0rJEg/OaSbU= =1yE7 -----END PGP SIGNATURE-----