00397nam a2200145Ia 4500008004100000020001800041041000800059082001500067100002200082245003700104250000600141260005100147300001200198650004100210210716s2015    xx            000 0 und d  a9788120344976  aeng  a005.8 SINB  aSingh, Brijendra.  aNetwork security and management.  a3  aNew DelhibPHI Learning private limited.c2015  axvi,400  aCryptography-Data encryption(005.82)