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-13.0-wheezy-amd64.iso.sig gpg: Signature made Tue Oct 15 16:56:16 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 46a0965f2812dbd9cbd3b4788c54e456f695e26b * md5sum b65a42d13dc4fbf97878cb640140a85b 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) iQEcBAABAgAGBQJSXXOlAAoJEIXCXpWhbrlNMgUIAIzI8qKbKCq926MZtkL7DzfL Aw6ueNFGNRNHpAlGWNazUMud5KTzkCKBIGDWJdg2xO5I+jk8yvxISQCKxZreJVCz dqD1TeF/RcvMB+e+5RDm4LJkRQl6/GcnFk649+m+pwLqTqKOXXouGDwq3qXhuINq odQuhTpS7PsnwXl81itO9OB3VeJ9JWrHfmoQ32VB1dEVZAjAkL4vMhPhcXXOFrNR Syp4TBd3kUJSb+x5grzZCWh9fya6mVv/pnwDZskQqn0NHGU5DRwKz286FqcyGawU XBE+cISfTzvJoqGGkEZwY3cM/50U9KupQP9UPp9/H360k7EdthZuvH+a0kTRcvY= =Nfhd -----END PGP SIGNATURE-----