100 ` ` ethical professionals '' register to participate in the Security Challenge ' . All of them will be selected to compete in simulated environments . Only one of them will win and be chosen for a master class .
19,000 `` ethical hackers '' register to compete in Cyber Security Challenge UK . 3,000 of them will be selected to compete in simulated cyberattacks . Only 42 of them will win and be chosen for a master class .