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1. Towards designing robust CAPTCHAs;Journal of Computer Security;2018-10-30
2. EmojiTCHA: Using Emotion Recognition to Tell Computers and Humans Apart;ICT Systems Security and Privacy Protection;2017
3. Efficiently Computing Data-Independent Memory-Hard Functions;Advances in Cryptology – CRYPTO 2016;2016
4. GOTCHA password hackers!;Proceedings of the 2013 ACM workshop on Artificial intelligence and security;2013-11-04