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Deepfakes With Shared Secrets: Building The Doppelgänger Protocol Feedback

Voice clones fool CEOs into wiring millions. AI-generated video calls scam elderly parents. Traditional authentication like passwords, 2FA, and biometrics can all be faked or phished. How do we verify identity when audio, video, and biometrics are no longer trustworthy?

In this hands-on session, we’ll explore The Doppelgänger Protocol: a cryptographic approach that transforms shared human memories into authentication keys. We’ll examine how memory-based verification combines challenge-response protocols, local-first cryptography, and zero-knowledge principles to create a new layer of human authentication that AI cannot replicate.

What you’ll learn

  • Why traditional authentication fails against sophisticated deepfake attacks
  • How memory-based challenges create cryptographic proof of shared human experience
  • The technical architecture: local key generation, challenge protocols, and privacy preservation
  • Real-world threat models: grandparent scams, executive impersonation, romantic catfishing

What you’ll do

After a focused technical breakdown, you’ll pair up with another attendee and experience the protocol firsthand. Using a live browser-based demo, you’ll create memory challenges together, generate cryptographic keypairs directly in your browser using the Web Crypto API, and verify each others identities in real time. You’ll see exactly how two strangers can build a trusted connection in minutes using memory-anchored cryptography through a mobile first experience.

This isn’t theoretical. This is cryptography deployed against the most urgent identity threat of our time. By the end of this session, you’ll understand both the protocol design and have working code you can examine, fork, and build upon.

Walk away with

A new mental model for human authentication, hands-on experience with the protocol, and insight into deploying cryptographic solutions for non-technical users facing AI threats.

Speakers for Deepfakes With Shared Secrets: Building The Doppelgänger Protocol:

Jonathan Bateman

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