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- W2029387404 abstract "Artificially synthesized sentences are used for malicious purposes such as unsolicited commercial junk submission to Web site. We study a problem to distinguish between natural and synthesized messages generated in Markov chains and show experimental results. Based on the difficulties of the problem, we consider a new application to CAPTCHA, a type of challenge-response test used in computing to ensure that the response is not generated by a computer. Based on the experimental results, we have clarified that the parameters of N = 1 (order of Markov model), n = 5 (natural sentences), m = 15 (synthesized sentences), and = 15 for threshold of acceptance are optimal in terms of accuracy and efficiency. Our proposed Captcha is practical in the sense that the FRR and FAR is 2% in average." @default.
- W2029387404 created "2016-06-24" @default.
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- W2029387404 date "2012-09-01" @default.
- W2029387404 modified "2023-10-18" @default.
- W2029387404 title "Word Salad CAPTCHA - Application and Evaluation of Synthesized Sentences" @default.
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- W2029387404 doi "https://doi.org/10.1109/nbis.2012.145" @default.
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