Hacking is a big challenge in the digital world. It has economic cost. According to estimates, it costs $400 billion or between $ 300 billion to $ 600 billion annually. Most of the losses are borne by G20 countries. The brunt is more on the US, China, Japan and Germany. Hackers from China attack the computer system.US stands next to China as a home for hackers. Some other countries with hacker groups are Turkey, Russia, Taiwan, Brazil, Romania, India, Italy and Hungary. Hacking attacks business and economy. It damages the performance of companies — their IP gets stolen. There are losses of financial assets and confidential business information. Cyber security has to ensure detection and handling of cyber attacks. Cyber cops are created by drawing people who are ethical hackers. These ethical hackers intrude into the systems so as to know its vulnerabilities and then plug the loopholes and security gaps. They can be used in future warfare too to invade the enemy systems.