I'm curious to know exactly how end-to-end encryption is implemented in popular messaging apps. What steps does a message go through from sending to receiving, what keys are generated, and where are they stored? And what vulnerabilities can arise from improper implementation? Share your experiences, links to articles, or code examples. How do you approach security verification?
How does end-to-end encryption work in messengers?
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What always confused me is how these keys sync between devices without leaking to the server—especially if the app doesn’t use Secure QR-code pre-sharing?