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-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 09:13:16 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum c6079eb19b268c6ea16a868f2fdb03aff02fa8d0 * md5sum 79f342339c527e765bc4b70db98aa1f2 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) iQEcBAABAgAGBQJSAg+hAAoJEIXCXpWhbrlNiRQH/3BFzGMjrXpU0Zfm5l6N1yHq bjUj7EyXz2UZamsWEbkUENcWyiGARfjb2W+LnF57a8Ejuv+jwqEEgsbdarukKzY3 xsGB1vpb/ZTHNMEVS5AtRyiheoycXAJBciVUo+HzZN7skYtjpYMJO73sw7vsX1k3 eTxDNNBKWhPUyHj2AR3EvF/wQiVgR/9NY7twU5SnCRR4Z/++euqDejhL7LlSBCF4 30RVOP7fu83EqovsA96nDoz4Ljc2R4eUNP4MWNKyS+m+z31AmLOFJFdTvv0adEy3 Wj8gmgs3sSQbC64mKYDEyXtZzH9/O/EvyzoeAecFGvl4xkXeTZun22Vu9u4GvZw= =eFRJ -----END PGP SIGNATURE-----