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Martin Kleppmann
@martin.kleppmann.com

Congratulations @lambda.bsky.social! Today @theguardian.com is launching a new way for whistleblowers to anonymously contact journalists, based on years-long research by Daniel and other colleagues. www.theguardian.com/gnm-press-of...

theguardian.comThe Guardian launches Secure Messaging, a world-first from a media organisation, in collaboration with the University of CambridgeSecure Messaging is a new innovation for confidential story-sharing and source protection, underpinning the Guardian’s commitment to investigative journalism. The Guardian has published the open sourc...
Martin Kleppmann
@martin.kleppmann.com

This system is baked into the Guardian's news app that millions of people have installed. Every regular user of the app generates cover traffic, and an attacker monitoring the network cannot distinguish someone using the secure messaging feature from a regular user.

Daniel Hugenroth
@lambda.bsky.social

Thank you so much @martin.kleppmann.com for all your help, guidance, and feedback during this project! Especially with the tricky bits around key rotation and concurrency. And glad that we were able to distill some insights from the production world already into our P79 course.

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