With the development of information security and the occurrence of endless security incidents, information security economics has become a new discipline and gained great attentions in academia. This paper analyzes the issue of optimal information security facing two classic types of attacks. With the consideration of business benefits bought by security investment, we identify the different characteristics compared to the previous studies, which can give meaningful inspirations to firms in reality. In addition, we innovatively use evolutionary game theory to study how firms choose the investment strategy in the long run. At last we give a conclusion and point out some fields for future researches.
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