Xanthus is a java implementation of the Netmesh Light-Weight IDentity(tm) protocol. You'll do best by reading about the protocol at http://lid.netmesh.org/.
The sources are in CVS. In order to check it out of CVS you'll
need to do something like this:
cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/xanthus co .
Note: LID is a trademark of NetMesh.