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-go-13.0-wheezy-amd64-ovf.zip.sig gpg: Signature made Wed Oct 16 08:08:33 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 6241873d3fd8a497e7b06ffcea7f43e44448faa2 * md5sum 744d3f5029a744f3a983e2156035962a 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) iQEcBAABAgAGBQJSXkl4AAoJEIXCXpWhbrlNqacH/inEK8QzjYexMzMfG/lMUiAE etA6GQsChSLJ9LnIzXA/n0DHKKcoKV5zooCiO9oGpO6fsNAB5BgH2Cm0qsdiTEwv hJIXLvFHAwJQwFYGgQgrND0RoJNKok+rZDUBoy33lSK4MFlfpK5XoNrOz2aFMpz2 1BO3QmrQSyB4jkBojZ6JPEZRXVXjpaMff773WoA7NSFEHLuxOYrpOiAdMlQWlBe+ hRETKrD+539o8PZyFfkvHVMEDNrrFxJ9Xy8sEd7sdNGUzK7aTpK2vlHIwG3U8NnY 9vVRjHHjB05UvUPluVMdaQLxLoZu5vfGGA8wGDAzBiCHswoKSoRR2dzzrc4CAuE= =sP78 -----END PGP SIGNATURE-----