Japan faces a full-on cyber-attack across government departments Tuesday in a drill aimed at bolstering national security as the country gears up to host the 2020 Olympics.

Japan is following the lead of Britain, which invited ethical hackers to test its computer systems in the run-up to the 2012 London Olympics. In the event, London parried multiple cyber-attacks.

Some 50 cyberdefense specialists were to gather at an emergency response center in Tokyo, with at least three times that many off-site, to defend against a simulated attack across 21 state ministries and agencies and 10 industry associations, said Ikuo Misumi, a hacking expert at the state-run National Information Security Center.