Homoglyph-Based Attacks: Circumventing LLM Detectors - Aldan Creo -NDC Security 2025

This talk was recorded at NDC Security in Oslo, Norway. #ndcsecurity #ndcconferences #security #developer #softwaredeveloper Attend the next NDC conference near you: https://ndcconferences.com https://ndc-security.com/ Subscribe to our YouTube channel and learn every day: @NDC Follow our Social Media! https://www.facebook.com/ndcconferences https://twitter.com/NDC_Conferences https://www.instagram.com/ndc_conferences As large language models (LLMs) become more and more skilled at writing human-like text, the ability to detect what they generate is critical. This session explores a novel attack vector, homoglyph-based attacks, that effectively bypasses state-of-the-art LLM detectors. We'll begin by explaining the idea behind homoglyphs, characters that look similar but are encoded differently. You'll learn how these can be used to manipulate tokenization and evade detection systems. We'll cover the mechanisms of how homoglyphs alter text representation, discuss their impact on existing LLM detectors, and present a comprehensive evaluation of their effectiveness against various detection methods. Join us for an engaging exploration of this emerging threat and to gain insight into how security researchers can stay ahead of evolving evasion techniques.