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cs.CY2025
NGCaptcha: A CAPTCHA Bridging the Past and the Future
Ziqi Ding, Shangzhi Xu, Wei Song +1
CAPTCHAs are widely employed for distinguishing humans from automated bots online. However, current vision based CAPTCHAs face escalating security risks: traditional attacks contin…
cs.CL2025
Debiasing LLMs by Masking Unfairness-Driving Attention Heads
Tingxu Han, Wei Song, Ziqi Ding +6
Large language models (LLMs) increasingly mediate decisions in domains where unfair treatment of demographic groups is unacceptable. Existing work probes when biased outputs appear…