This web content presents an easy system for remote authentication between two individuals to ensure they are not digital impersonations. The author introduces a simple solution involving setting up a time-based one-time passcode (TOTP) between two people. The process involves generating QR codes for each person, scanning them into a TOTP mobile app, and using the 6-digit TOTP code for verification in future interactions. This method adds an extra layer of security for confirming identities during phone or video calls. The author describes the system as simple and clever, with the potential to enhance personal authentication protocols.
https://www.schneier.com/blog/archives/2025/02/pairwise-authentication-of-humans.html