China's high school students are particularly vulnerable to cyberattacks compared to those in other countries, a survey released on Wednesday has found.

Almost half of the high school students polled in China said their online passwords had been obtained illegally by others, much higher than in the United States, Japan and South Korea.

The survey, which focused on the safety of high school students, was conducted by research institutes in the four countries. More than 7,600 students took part.