Ummm... isn't that what the .asc file is (hint open it and look). It has been included with the torrents since he started them, and if I remember correctly, then it has been on the FTP servers since i started in late 1.x.

it is (from the 3.4 us file

----BEGIN PGP SIGNED MESSAGE-----

49a62cdac7a3afcee0d2d47ea17daa6f *KNOPPIX_V3.4-2004-05-04-EN.iso
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iQCVAwUBQJa5kTLvxgG6jwONAQGLtQQAmbMJkqiTW1gXFqaQlo op2UI2Vg5K/p2p
liWF0ELC9VPl4hQtD9Mt7NFHxlQ6rkZXMPAhncc3raEgJk8dej EYbtKWUJ9oSvId
485nu8+3qAwHO/iSvQpjA4grM7gEW2ltB21kIs9DvBc2jbH3WQ7kUy8R1iEWAdDe
S6yru/BntX8=
=DNzr
-----END PGP SIGNATURE-----