Lockhart, Andrew. creator text Beijing O'Reilly c2004 monographic xv, 298 pages : Illustrations ; Includes index. Computer networks - security measures Internet - security measures Computer security TK 5105.59 LOC 0596006438 8173663521 http://www.loc.gov/catdir/enhancements/fy0915/2004302105-d.html http://www.loc.gov/catdir/enhancements/fy1010/2004302105-t.html http://www.loc.gov/catdir/enhancements/fy1105/2004302105-b.html http://www.loc.gov/catdir/enhancements/fy0915/2004302105-d.html http://www.loc.gov/catdir/enhancements/fy1010/2004302105-t.html http://www.loc.gov/catdir/enhancements/fy1105/2004302105-b.html