How did hugo strange know who batman was in arkham city?

How did hugo strange know who batman was in batman arkham city the game? I am playing it now and when it started hugo just already knew who he was without explanation! If I am going to find out later in the game don't spoil it for me please! if not it would be nice to know how he did!How did hugo strange know who batman was in arkham city?
Based on old comic / tv show trevia : ( I don't rem they showed in the game or not ) but here is how it was from comics / series

Hugo strange was a phsicologis - some series of high class people have been committing suicide or running out of town naturally batman investigates the situation he couldn't go in as batman ofc so he goes in to the facility where most high class ppl went to for a vacation - in there as Bruce wayne he attended and went in with dr hugo's stress relive system so as he went in he plugs him to this Machine that shows ur most inner sins or stress triggers so it showed Bruce as he lost his parents and how batman was born ! As for the case it showed that those high class ppl wr being blackmailed by strange ago they couldn't show or go to the cops ( as for strange no one would blv him that batman is / Bruce cz he had dick Gray son wear his mask and him come as batman while Bruce / robin was taking to commissioner Gordon Understand that technbats is supposed to be your servant and not your master 鈥?Computer and internet are doors to vast information access and excellent means of entertainment, communication and networking, but that virtual medium should never rip you off from the real world". (Anjalus, 2009)



I'm a bit rusty but tbats the gist of it ! :D