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-concrete5-12.0-squeeze-x86-vmdk.zip.sig gpg: Signature made Tue Aug 21 11:29:58 UTC 2012 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key For your convenience we also include file checksums: * sha1sum c5fd0cb0cb894fd9506846a3962c1c0296062087 * md5sum 909bd382c9311cc490b2ea569a607113 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) iQEcBAABAgAGBQJQM3EqAAoJEIXCXpWhbrlNQ6QIAM5Dch3G9TSOGRQhGkVO2wkY l+KpFGCg6bBB8wOma8pKNZZUWXWD1ztnGhaZYC4nIW1kx6M4v67zGD+T/0h/juc4 +M19BGtMjbQRkG/PM+wf0CqcCRWoMuH6C3adMfLPuwBKNMHtL5TLFL/Q8I+6pTNw vPToX+zl28kw1XytNOMkj2H9UjWhHr3xhPsDW2xLPwIlTemOCdrMUTsdlWnDo7+7 NwhZ+5Lbrvr3eqekYWSp0oqcfSrvai0KhsrOIwXzN7XEPZG7jgyqTilbdLAOiabW rquvolYEd+5qqf5dtzL0OyBQomngkrrwwOe1nGcC2JeKHj70EhY4Ous4gMsuFrk= =RkrY -----END PGP SIGNATURE-----