Japan faced a full-on cyber attack across government departments Tuesday in a drill aimed at bolstering national security, Reuters reports.

Similar to the ethical hacker testing for the London 2012 Olympics, 50 cyber defense specialists gathered at an emergency response center in Tokyo, with at least three times that many offsite, to defend against a simulated attack across 21 state ministries and agencies and 10 industry associations, the article says.

The exercise simulated a phishing attack, where government officials or businesses opened up their servers to a computer virus by visiting a fake website.

Cyber attacks against a closed Japanese network designed to measure hacking increased last year to 12.8 billion times, from 7.8 billion the previous year.