Humanity is quickly dividing itself into two groups: the hackers and the hacked off. Attacks on the computer systems on which we rely for almost everything have become a regular nuisance. And they threaten to be much more than a nuisance. The internet, the worldwide protocol for computer-to-computer contact, makes it possible to order goods online, connect to a streaming video service and share cat pictures on Facebook. But it also leaves any computer connected to it vulnerable to attacks by people with high IQs and low morals. Just in the last few years: —On Nov. 15, a cyberattack hit about 500 of the ...