00346nam a2200133Ia 4500008004100000020002200041100002300063245006100086250001100147260001600158260000900174300000800183650002100191221231s9999    xx            000 0 und d  a978-81-317-1664-9  aStallings, William 0aNetwork Security Essentials : Applications and Standards  a3rd Ed  bPearson Edu  c2009  a409  aComputer Science