A Security Analysis of Captchas With Large Character Sets

Ping Wang, Haichang Gao, Qingxun Rao, Sainan Luo, Zhongni Yuan, Ziyu Shi. A Security Analysis of Captchas With Large Character Sets. IEEE Trans. Dependable Sec. Comput., 18(6):2953-2968, 2021. [doi]

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