The Investigative Research for Infrastructure Assurance (IRIA) group is part of the Institute for Security Technology Studies (ISTS) at Dartmouth College. IRIA focuses on electronic crimes that involve or target computer networks, for example, the denial-of-service attacks that shut down Yahoo and other major web sites in February, 2000. Our web site at http://www.ists.dartmouth.edu/IRIA/ has more information about our projects and staff.
Both tools provide strong authentication for the host by checking a host key at each connection setup. If the host key changes, loud warnings go out and packets are not allowed to pass. Ssh also authenticates the user making the connection, by means of a password or passphrase.