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-tomcat-apache-12.1-squeeze-i386.iso.sig gpg: Signature made Thu Apr 18 14:07:41 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 5758b5d3d294e2f4f26490b69d3ee765103c86dc * md5sum 72999d0b3a659b7ca20063df11da4342 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) iQEcBAABAgAGBQJRb/4gAAoJEIXCXpWhbrlN3ZIIAKASDzLky0IHBszVRaKZW2zE 1+E7C+3yXGAaTx/vp7uzr7W3hHdcol1NMX3/p26V9iXAiPQxGlhDub3kf7yL72xO Bn4L+C57NON5LqyFS84LhPsGCxyRPMVhsPt9JCq5P7tz65+fro0IBgGU0gSUFAP0 NUAu2DtYWFCX8RlPDLqGWc5+wrXFgpOzrJgldfpP/FLddDYKW6LhYCqxnyomsoLl q7ZNIl0+p4pXuL6gCU0PCYilzVNfTg523PBS0Du5y603kl3jcrVddAXHhd/IwqPY Z45LoAcfyka6DdIGzMR+OGAt2Ge4dzl/W0dhHSDL0lfAzpkUo2EvhjK8dRj8Wx8= =pj1e -----END PGP SIGNATURE-----