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-amd64-ovf.zip.sig gpg: Signature made Tue Jun 4 12:28:49 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum b52109827dec813646299799476494526caf244f * md5sum 7e843dc2641543e2c9a39959726a6cb3 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) iQEcBAABAgAGBQJRrd1wAAoJEIXCXpWhbrlNs50H/3Gd6MR9/yHa2NiqlWx2rEC6 9AoQcvn+uGb7WMjrmWEM5o5Ci/4VrCD3frCKo+36TkwsCIMeO7aab/61w+GSrtea 8ynSwXAEglHt0vgvZwZRQLUbXVSDSuGKHiwyu/aLm4+nC5dSMRVmgNvDEVy6pHnu 38TWdyn3O1IOKmvjWY0zoAZQGmQGcvbCqd60NgptmGvo5SMWqlvdf2RZdjoOI8Hz tl65/l+MxqCb2SHsyYNky+c4uKp28NY/23YsdwMFxE9FLVuH8ukMxFn2E0eGy/ie EjFoqA9ADmuxdHlTvI0SoO61L8m8PrqwoDuSVaGlYa07Hh1/Ik1Bos69zlemph0= =8VrO -----END PGP SIGNATURE-----