00332nam a2200133Ia 4500008004100000020001800041100002300059245003800082250001100120260001600131260000900147300000800156650003400164221231s9999    xx            000 0 und d  a81-265-0821-3  aStallings, William 0aCryptography and Network Security  a4th Ed  bPearson Edu  c2009  a680  aElectronics and Communication