The memo - drafted by DHS's Cybersecurity and Infrastructure Security Agency and the Federal Risk and Authorization Management Program, which screens software used by government bodies - sounded a positive note about the teleworking solution, which has been beset by security worries since the coronavirus outbreak drew in a flood of new stay-at-home users.

DHS and FedRAMP said Zoom Video Communication Inc. was responding to the criticisms and understood how serious they were - a contrast with the formal advice against using the product issued on Tuesday by Taiwan's Cabinet.

Former White House Chief Information Officer Theresa Payton noted that while the message applied to the version of Zoom marketed to US officials - Zoom for Government - it was still "good news" for the San Jose, California-based company.

"I see it as a pragmatic memo," said Payton, who is chief executive of cybersecurity firm Fortalice Solutions. She said the General Services Administration, which helps run FedRAMP, "had to say something" given the mounting disquiet over Zoom's issues.

That is in part because the company's new popularity as a main way to connect to colleagues, classes, friends and family while stuck at home has meant newfound scrutiny.

[RA::Video app Zoom rockets to fame, with some hiccups, amid pandemic::/life/2020/04/04/video-app-zoom-rockets-to-fame-with-some-hiccups-amid-pandemic.html

Most recently, University of Toronto-based internet watchdog Citizen Lab said it found "significant weaknesses" in the encryption protecting the confidentiality of Zoom meetings as well as evidence that encryption keys - key bits of code whose possession could enable a hostile power to eavesdrop on conversations - were sometimes being sent to servers in China, even when the meeting's participants were in North America.

Some schools and businesses have stopped using the service, among them Elon Musk's rocket company SpaceX, which Reuters reported last week had banned its employees from Zoom.

Zoom did not comment on the memo, instead pointing to previous comments made by the company's CEO, Eric Yuan, who has publicly pledged to do better.

"We'll double down and triple down on privacy and security," Yuan recently told CNN.

DHS and FedRAMP said in a joint statement that the memo was a best practice guide for government users, who it said were advised to use the Zoom for Government over the company's free or commercial offerings. 

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