00321nam a2200121Ia 4500008004100000100002100041245006300062250000900125260002700134260000900161300000800170650002100178221231s9999    xx            000 0 und d  aStalling , Willi 0aCryptography and Networks Security Principales and Pratice  a3 rd  bPrentice-Hall of India  c2003  a681  aComputer Science