(Recasts, adds details on Zoom's encryption plan, CEO quote)
By Supantha Mukherjee
May 7 (Reuters) - Zoom Video Communications Inc will launch consultations on May 22 on the first draft of cryptography it plans to use to offer end-to-end encrypted meetings to all paying subscribers, as it seeks to quash criticism of its platform over security.
The company, which has faced backlash from users for failing to disclose that its service was not fully encrypted, is planning to develop tools that will give more controls to meeting hosts and allow users to securely join a meeting.
It also said here on Thursday it had bought Keybase, a secure messaging and file-sharing service, for an undisclosed price as it sought the encryption engineering expertise to deliver complete encryption for its conferencing platform.
Shares in the company rose another 8% to $161 in morning trading.
After preparing the draft design, Zoom plans to host discussions with cryptographic experts and customers, and integrate feedback into a final design before rolling the feature out to users.
"We are also investigating mechanisms that would allow enterprise users to provide additional levels of authentication," Chief Executive Officer Eric Yuan wrote in a blog post here
Founded in 2014, Keybase here is an encrypted messaging platform where an user can write to any Twitter or Facebook user without knowing someone's phone number or email address.
Zoom has seen an extraordinary jump in users, now numbering 300 million participants a day, since the coronavirus crisis forced millions of people and students to work from home.
But concerns about the security of its platform have led companies including Elon Musk's SpaceX and Sweden's Ericsson to ban employees from using the platform.
To address security concerns, Zoom embarked here on a 90-day plan which has included hiring former Facebook security chief Alex Stamos and other known industry figures while launching new versions of its software with better encryption.
Zoom also said it will neither build any cryptographic backdoors to allow for the secret monitoring of meetings, nor will build a mechanism to decrypt live meetings for lawful intercept purposes.
Reporting by Supantha Mukherjee in Bengaluru; Editing by Krishna Chandra Eluri