000 00285nam a2200121Ia 4500
008 241124s9999 xx 000 0 und d
100 _aGupta, K.N; Agarwal, K.N.
245 0 _aDigital Signature : Network Security Practice
260 _b-
260 _c0
300 _a209
942 _cBK
999 _c5959
_d5959