00486nam a2200157Ia 4500008004100000020001400041082001400055100002300069245006400092250000800156260004500164300002900209500001900238600002100257650005000278240925s9999    xx            000 0 und d  a139738193  a005.8 STA  aStallings, William 0aCryptography and Network Security: principles and practice   a2nd  aNew Jersey:bPrintice- Hall Int.c,1999.  axiii,144p.bNAfOriginal  aIncludes Index  aComputer Science  aComputer science, information & general works