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Author

Mehmet Batuhan Özdaş

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Open access Sep 2026

BREAKING AND SECURING TEXT-BASED CAPTCHAS: AN EMPIRICAL STUDY ON BANKS' ONLINE AUTHENTICATION SYSTEMS

Digital transformation has made online banking services essential, increasing the need for strong security to protect sensitive user data. To distinguish human users from automated bots, banks often use CAPTCHA systems. This study evaluates the security of text-based CAPTCHAs used by Turkish banks in their online authe...

Onur Ceran, Mehmet Batuhan Özdaş, Uğur Tekin · 0 citations
Jul 2026

DWT-Fusion: A Signal-Based Framework for Training-Free LLM-Generated Text Detection

Detecting LLM-generated text remains challenging under zero-shot and training-free conditions, especially when detectors must generalize across datasets, domains, and unseen generators. While existing training-free approaches exploit language-model statistics as detection signals, they typically characterize a text thr...

Mehmet Batuhan Ozdas, Murat Osmanoglu · 0 citations

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