00299nam a2200121Ia 4500008004100000020001800041082000800059100001700067245006300084250000800147260001400155300000800169160921s9999    xx            000 0 und d  a81-203-2385-8  a641  aSTALLINGS  W  aCRYPTOGRAPHY AND NETWORK SECURITY Principles and Practices  a3rd  bPHIc2003  a681