Michael Rash is author of the book Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort, published by No Starch Press, and holds a master’s degree in applied mathematics with a concentration in computer security from the University of Maryland. He is a frequent speaker at computer security conferences, and is the founder of cipherdyne.org, an organization dedicated to open source security technologies. In his free time, Michael leads the development of the psad, fwsnort, and fwknop security projects.