Use of the popular videoconferencing service Zoom has skyrocketed as schools and workplaces remain closed during the COVID-19 pandemic. However, the increased traffic has also put a spotlight on potential security and privacy problems.

Zoom went from 10 million daily meeting participants at the end of December to more than 200 million in March, according to parent company Zoom Video Communications. But Zoom’s higher profile has brought scrutiny and made it a target for hackers and pranksters.