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-i386.iso.sig gpg: Signature made Mon Oct 14 19:20:01 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 92ecd4546ecfeb759287de2bde4613f30d504037 * md5sum 0dcc09654ff0920537b6571e6194933d 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) iQEcBAABAgAGBQJSXEPTAAoJEIXCXpWhbrlNvdMH/RfU9ve96cPufuq0/7aFi+2n Pp2cQtURda/+sCQE1AyRKl38yuUgLJbNzUDMcdN+WqvssWpQLv5tvCt04jqBTbSc qKVw9dq1ikhTXJAWOTjMepseNfjXRANlO9xk2a7GCS0iAsaQ/RNLCrgCB45K1c7C ROtPLqxuZwWznTXdoglyCUdwdTx4fOmuHK6N75QFAy4WpCoYyDzQDJBDjva8nWzU Av2ALihMayaVX5J9xUrOxyJagc3fOwXPYQ+0Di+XR/ED2etRnoIDyUNa0oCAzrbL IxQwc1bl6KeTjVLZLANPlO+YjBVj1F14LS118d4zydMjS7F8UBORPRqIbYSAiMw= =8+U2 -----END PGP SIGNATURE-----