KeHoSu: Keyed Homoglyph Substitution for Authenticated Text Provenance over Copy-Paste Channels

Summary

KeHoSu is a method that encodes an identifier in the choice of confusable Unicode homoglyph characters, so text generated by an LLM can be attributed to a platform and account even after copy-paste. The authors evaluated it across 18 common platforms and report that the mark survived copy-paste and attributed most excerpts correctly at 178 letters on LLM-generated stories and 167 letters on standard English prose.