Public domain security tools

Some very useful tools are crack, SATAN, ISS, Tripwire, COPS, PGP, tcpwrapper, wuftpd

These and more at

     * ftp://ciac.llnl.gov
     * ftp://coast.cs.purdue.edu
     * ftp://crimelabs.com
     * ftp://ftp.cert.org
     * ftp://ftp.nec.com
     * ftp://ftp.win.tue.nl
     * ftp://net.tamu.edu
     * ftp://thumper.bellcore.com