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Shares of Zoom rose 12 per cent to a record high of $168.24 on Thursday.Dado Ruvic/Reuters

Zoom Video Communications Inc.'s user base grew by another 50 per cent to 300 million in the past three weeks, as the company fought to quell a backlash around security and safety that has seen a number of governments and firms ban its applications.

Shares of Zoom, which have surged nearly five-fold since the company went public in March last year, rose 12 per cent to a record high of US$168.24 on Thursday.

Chief executive Eric Yuan gave the numbers late on Wednesday in an update on the platform’s 90-day security plan, while also outlining the rollout next week of a new version of the app with more encryption features.

German automaker Daimler AG was the latest company on Thursday to say it had banned use of Zoom for all corporate content until further notice.

“There are some reports about security gaps and challenges regarding data protection of Zoom,” Mercedes-Benz Cars spokesman Christoph Sedlmayr said.

“This does not comply with the security requirements of our company. Therefore, we can confirm that Daimler prohibits the use of Zoom for corporate content until further notice.”

Bloomberg News also reported wireless technology firm NXP had banned the app’s use with external parties, and that employees at Sweden’s Ericsson had been advised not to use it.

“We have not prohibited employees to use any collaboration tool, but we advise employees to be cautious with unapproved collaboration tools due to security risks,” an Ericsson spokesman said.

Zoom was banned by many schools around the world, Elon Musk’s venture SpaceX, Asia-focused bank Standard Chartered PLC as well as governments in Germany, Taiwan and Singapore.

A Zoom spokesman reiterated that companies across the world have done exhaustive security reviews of its platform and were using its services.

The coronavirus-driven lockdown of millions of people globally has driven huge growth in use of platforms such as Zoom, Skype or Microsoft’s Teams application.

Zoom’s growth has continued even as it faced a barrage of criticism from cyber-security experts and users alike over bugs in its codes and the lack of end-to-end encryption of its chat sessions.

It has appointed former Facebook Inc. security chief Alex Stamos and a number of other experts to attack these concerns, and security researchers say it has responded robustly to the issues.

Researchers say “Zoombombing” incidents, where uninvited guests crash meetings, were caused by simple choices made by some of the millions of new users of the app and that the company has taken sensible steps including giving hosts the ability to lock meetings and restrict what attendees can do.

For corporate customers, however, the issue of encryption and who keeps records or can listen in to calls is more important, be it to safeguard valuable company information or meet privacy obligations to customers.

Lea Kissner, formerly global lead of privacy technology at Google, and now a security consultant for Zoom, said the 256-bit GCM encryption being introduced with Zoom 5.0 next week was in line with what others in the industry were using.

All Zoom customers will switch to the new cryptographic mode from May 30, Ms. Kissner said.

To account for criticism that the company had routed some data through Chinese servers, Zoom also said an account admin can now choose data-centre regions for their meetings.

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