Papers by Haochun Tang
DuFFin: A Dual-Level Fingerprinting Framework for LLMs IP Protection (2026.findings-eacl)
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| Challenge: | Large language models are valuable intellectual property due to the computational cost of training. |
| Approach: | They propose a dual-level fingerprinting framework that extracts trigger patterns and knowledge-level signatures to verify black-box ownership. |
| Outcome: | The proposed framework verifies the copyright of protected LLMs on their variants, achieving an IP-ROC greater than 0.99. |
Route to Rome Attack: Directing LLM Routers to Expensive Models via Adversarial Suffix Optimization (2026.acl-long)
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| Challenge: | Existing routing attacks depend on white-box access or heuristic prompts, rendering them ineffective in real-world black-box scenarios. |
| Approach: | They propose a cost-aware routing strategy that routes queries to the least-cost model . they propose heuristic prompts that are ineffective in real-world black-box scenarios . |
| Outcome: | The proposed approach significantly increases the routing rate to expensive models on queries of different distributions. |