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WhatsApp Key Transparency with Jasleen Malvai and Kevin Lewi
Security Cryptography Whatever
WhatsApp's Key Transparency Solution
The biggest successful deployments used to be certificate transparency. For end-to-end encryption, I don't know if any other system has deployed a key transparency solution anywhere close to the scale that WhatsApp is trying to achieve. And that's not even including how many multi-device keys those users have and how often those keys get rotated because these phones fall in the ocean or the toilet all the time.
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