An "open-thoughts" research — Ad Hoc Broadcast, Trace, and Revoke.
Traitor-Tracer is an invisible image watermarking system for source tracking and traitor identification, with built-in evaluation against common image attacks such as cropping, resizing, noise, and compression.
Trace a leaked document photo back to the exact copy it came from. Invisible per-copy fingerprints for printed documents, decoded blind from a phone photo.
Browser-based broadcast encryption demo — NNL 2001 subset-difference. Encrypt once to a subset, revoke a member without touching anyone else's keys, then trace a leaked decoder back to the traitor by watching what it can and cannot open. Collude past the bound and tracing fails. The math behind AACS. No backends. No simulated math.
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