00375nam a2200157Ia 4500008004100000020001800041082001700059100002600076245003800102260001400140260001200154260000900166300000800175365000800183650002600191231117s9999    xx            000 0 und d  a9789332585225  a658.4063 STA  a"Stallings , William" 0aCryptography and network security  aNew Delhi  bPearson  c2022  a804  b825  aXIMI Computer Science