00399nam a2200169Ia 4500008004100000020001800041082001500059100002600074245003800100250000900138260001400147260001700161260000900178300000800187365000800195650002600203231117s9999    xx            000 0 und d  a9789332585225  a005.8 STA   a"Stallings , William" 0aCryptography and network security  n7th   aNew Delhi  bPearson Pub.  c2022  a766  b799  aXIMI Computer Science