00257nam a2200109Ia 4500008004100000020001800041040000800059100001700067245003700084260001800121300000800139231229s9999    xx            000 0 und d  a9788131502488  cRIT  aNEAL KRAWETZ 0aINTRODUCTION TO NETWORK SECURITY  c2007bTHOMSON  a583