000 00265nam a2200109Ia 4500
008 190516s9999 xx 000 0 und d
100 _aSTALLINGS WILLIAM
245 0 _aCRYPTOGRAPHY AND NETWORK SECURITY
260 _c2007
_bPEARSON EDU
300 _a686
942 _cBK
999 _c19159
_d19159