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-13.0-wheezy-amd64-vmdk.zip.sig gpg: Signature made Wed Oct 16 08:17:27 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 85697204f6ab74078fdf4207340fa6122e493944 * md5sum 6ad880ce14ffbfbfdbbf07be14447c11 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) iQEcBAABAgAGBQJSXkuFAAoJEIXCXpWhbrlNcoYIANtDpmnvJ2kCxuAuCQWZ+G6Q +ZuFE8bzcim7GTeKqAHbShFI2kk0i3BpPwwiAmP93buglvTgUKr14ZpMNwNOI9z+ L5aBnTxOJeWFpTL5xxgTvTsTOQkFzEe56FVxjhNGPOyidXF8AxeDP9NJVpsc3axj wFHvAPABEJyc0VZNDeBXb7+07DeiVd7pMjGdrKzWT5YxgXq2EU7Hqq3ejK/S093x 5B1u+pDu0UpupZP4TYjtDANAljbcwwVsBlUgsbZI3fLGKLLQ0Op0j87Xc1HiXTBS vRwIRubMIheqYavAQMehuoEi/AWmGURww+ZZs+VA0GKJZLnhTXyushGwgB+RRDg= =XWsq -----END PGP SIGNATURE-----