00454nam a2200169Ia 450000100060000000800410000602000180004704000130006508200190007810000230009724500840012025000080020426000370021230000110024954600070026065000170026739843140423s9999    xx            000 0 und d  a9788177587746  cPK-LaUMT  a 005.82bSTA-C  aStallings, William  aCryptography and network securitybprinciples and practicescStallings, William  a4th  aNew Delhi,India:bPearson,c2009  a680 p.  aEN  aCryptography