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-python-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 07:33:43 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 436cd5226baba9af5ac33ed7faf6022a807ac731 * md5sum 9a01219554eb0e40aa808d641db2a128 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) iQEcBAABAgAGBQJSMr/MAAoJEIXCXpWhbrlNf2EIAMKGQsLDHli76pkAGIkKeB/2 p27AIKX4ZB1K3cuSBwDAHXNKoiep/rrqr4M0EWS9sm1Tb5d5XU6+CzPDTRNxsYjh sKwe38PQ6ZDn+OhBtPJsNDYSggkq+j2TIaSXi7uPOexTd3FzkAaNYZYEhPPgSpbX PelWElU3m/Vu7qyYx7RbQrGgV1YKIkdJXmdXKTckt5a75umjf4ppCxVfI1ril/+l TDc3kAQAHwxWEv8ogZVK1LdXafTSNxdEbuPTWzmGmcT8Dxj3RsS293pWaCWJVy7L dngLfW84QFH05HO8DcYOHmZgBo52TjpnS9q1n/TJeaCfIZ/0hlGqssh8M+4WFK8= =Y5p3 -----END PGP SIGNATURE-----