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-7-turnkey-appengine-java_13.0-1_amd64.tar.gz.sig gpg: Signature made Wed Oct 16 08:32:08 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum b3434a4a62313bcfbd08f7d4625c02e09c085e00 * md5sum 195c1f0ea2222697c0033e4d5370ca19 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) iQEcBAABAgAGBQJSXk75AAoJEIXCXpWhbrlNB14IAN8nQmjrLljPcAWwWz698ot2 5ygUib3tKaQc1mGkPjcHCuB2UrICjkP7EQBZbp9jwlWGEDfiQ06gnB6F4fX0a4eI YKE7qvTVDIM57+u44OJyx9hqjzmm56qT18ffVbWb/Qtv3apF4QogAtWegzAx+qN4 CZEEU/H8yyXHyGVuPQXrzWb5gDBGKtkrZZ7FnlZ6YMuoKVw7224a+J9UxxvPp3T7 +fvXttTnaJh+PZmokLrS89e9MvWHi71Fu5dfcy3MCmqIlaJq6lDJdKbKr9Z7RYgM Av0U1bB4KUVsBDP7ii5jrsWZs1UwojGHKb0aO62ARKtnuwYh2F6hFYb6mVfK9Fc= =BwMF -----END PGP SIGNATURE-----