000 00250nam a2200097 4500
020 _a9789350146637
100 _aDR. UMESH SEHGAL & Ms. KULJEET KAUR
245 _aNETWORK SECURITY AND CRYPTOGRAPHY
260 _aNEW DELHI
_SS.K. KATARIA
_c2020
942 _cBK
999 _c1945
_d1945