Last year we have witnessed WannaCry, the virus imposing threat to the computers across the world. It crashed many computers asking for ransom in order to restore the data. However the experts were able to successfully control this attack. Most of our computers have efficient antivirus software to prevent the virus. But neither of the antiviruses was able to control the WannaCry attack. What is the reason behind it? How can we effectively prevent such attacks in future? For more details refer : custom essay writing service