00360nam 2204637 45000010005000000030023000050050009000280080041000370820013000781000022000912600033001132500019001462450063001654637StarLibrary Marc Built20180713201711 ||||| |||||||||||amh  a004.6522 awilliam stallings bpearson prentice hall c1998 aالطبعة 4 acryptography and network security prinnciples and practice