000 00233nam a2200097Ia 4500
008 170619s9999 xx 000 0 und d
100 _aStallings- William
245 0 _aCRYPTOGRAPHY AND NETWORK SECURITY
260 _bPearson
260 _c2009
546 _aENGLISH
999 _c19061
_d19061