Australian lottery
I want to know about this also secure my identity

Sir

I am Sheikh Rehanuddin from india i got aa mail from Austrilian lottery regarding my winning $450000 so i given some reply then they told to me to pay some taxex around $300 (15000 INR) and i will get my winning amount within 48 hrs. i not paid that amount till yet but i given them my adress and account number so i will creat any problem but they srnd a deposit certificate via mail how can i know the true of this certificate plz tell me as soon as possible