Security News > 2025 > February > Pairwise Authentication of Humans

Here’s an easy system for two humans to remotely authenticate to each other, so they can be sure that neither are digital impersonations. To mitigate that risk, I have developed this simple solution where you can setup a unique time-based one-time passcode (TOTP) between any pair of persons. This is how it works: Two people, Person A and Person B, sit in front of the same computer and open this page; They input their respective names (e.g. Alice and Bob) onto the same page, and click “Generate”; The page will generate two TOTP QR codes, one for Alice and one for Bob; ...

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https://www.schneier.com/blog/archives/2025/02/pairwise-authentication-of-humans.html