Nelson Murilo has been a Network Security Analyst since 1992. He is the author of two network security books in Portuguese and a regular contributor of Brazilian Computer Emergency Response Team published papers (security guides and technical papers). Nelson is the author and co-author of open source security tools like chkrootkit and Btsearch. Regular speaker in Brazil and international conferences and is one of the organizers of a Brazilian security conference YSTS (you sh0t the sheriff).