00354nam a2200157Ia 45000010006000000050017000060080041000230410008000640820015000721000028000872450049001152600009001643000007001736500008001806540008001881401620260306164843.0260306t2012||||xx |||||||||||||| ||spa||  aESP  a005.8bS78  aStallings, WilliameAUT 0aComputer security :bprinciples and practice  c2012  ac  aGEN  aCCC